AI Trajectory

null

{
  "EnableConfigs": [
    "INET_PSP",
    "INET"
  ],
  "FocusSymbols": [
    "sk_clone",
    "psp_sock_assoc_set_rx",
    "psp_sock_assoc_set_tx",
    "psp_sk_assoc_free"
  ],
  "KMSANReasoning": "The patch modifies `sk_clone()` in `net/core/sock.c` to explicitly initialize `newsk-\u003epsp_assoc` to `NULL` via `RCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL)`. \n\nWhen a socket is cloned, `sock_copy()` performs a shallow copy of the socket structure from parent to child. Without clearing `newsk-\u003epsp_assoc`, the cloned socket inherited the parent's pointer to `struct psp_assoc` without taking an additional reference count. Upon destruction of the cloned socket (`psp_sk_assoc_free`), `psp_assoc_put()` would be called, leading to reference underflow, use-after-free, or double-free errors.\n\nThis change is purely addressing object lifecycle, pointer aliasing, and reference counting issues (which are detected by KASAN). No uninitialized memory is allocated, read, or leaked to userspace. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch ensures that the socket's psp_assoc pointer is cleared during sk_clone() when INET_PSP is enabled, preventing the newly cloned socket from inheriting the parent socket's PSP association pointer without incrementing its reference count. This avoids potential use-after-free and double-free conditions upon socket destruction.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 3a5a85ebbac69752e0afaf6ca888b53aa56f049f\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Sat Aug 29 17:23:14 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/core/sock.c b/net/core/sock.c\nindex 1ad41904db25b..fa60b7494c586 100644\n--- a/net/core/sock.c\n+++ b/net/core/sock.c\n@@ -2494,6 +2494,9 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n #ifdef CONFIG_BPF_SYSCALL\n \tRCU_INIT_POINTER(newsk-\u003esk_bpf_storage, NULL);\n #endif\n+#if IS_ENABLED(CONFIG_INET_PSP)\n+\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n+#endif\n \n \t/* SANITY */\n \tif (likely(newsk-\u003esk_net_refcnt)) {\n"
}

core

null

{
  "EnableConfigs": [
    "INET_PSP",
    "INET"
  ],
  "FocusSymbols": [
    "sk_clone",
    "psp_sock_assoc_set_rx",
    "psp_sock_assoc_set_tx",
    "psp_sk_assoc_free"
  ],
  "Reasoning": "The patch ensures that the socket's psp_assoc pointer is cleared during sk_clone() when INET_PSP is enabled, preventing the newly cloned socket from inheriting the parent socket's PSP association pointer without incrementing its reference count. This avoids potential use-after-free and double-free conditions upon socket destruction.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit 3a5a85ebbac69752e0afaf6ca888b53aa56f049f
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Aug 29 17:23:14 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/core/sock.c b/net/core/sock.c
index 1ad41904db25b..fa60b7494c586 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2494,6 +2494,9 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority,
 #ifdef CONFIG_BPF_SYSCALL
 	RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
 #endif
+#if IS_ENABLED(CONFIG_INET_PSP)
+	RCU_INIT_POINTER(newsk->psp_assoc, NULL);
+#endif
 
 	/* SANITY */
 	if (likely(newsk->sk_net_refcnt)) {

gemini-3.7-flash

null

null

							input: 2082
							output: 70
							thoughts: 129
						

**Analyzing a Kernel Patch**

Okay, let's dive into this commit. The initial focus is the change within `net/core/sock.c`, specifically the `sk_clone` function. The patch itself is simple, a conditional initialization:

```c
#if IS_ENABLED(CONFIG_INET_PSP)
	RCU_INIT_POINTER(newsk->psp_assoc, NULL);
#endif
```

My initial thought is to understand the context. I'll use a `read-file` or `grepper` command to pull up `net/core/sock.c` around line 2494 to see what surrounds this code. Understanding the surrounding code will likely give insights into why this line of code exists. I'll also want to understand the role of `CONFIG_INET_PSP` and `psp_assoc`. I will search the entire tree for both of these, to get a better overview of how this functionality fits into the bigger picture. This will likely involve using `grepper` or a similar tool. This should paint a clearer picture of the purpose and implications of this modification.

{
  "File": "net/core/sock.c",
  "FirstLine": 2480,
  "LineCount": 40
}

{
  "Contents": "2480:\t\t\t      bool lock)\n2481:\t{\n2482:\t\tstruct proto *prot = READ_ONCE(sk-\u003esk_prot);\n2483:\t\tstruct sk_filter *filter;\n2484:\t\tbool is_charged = true;\n2485:\t\tstruct sock *newsk;\n2486:\t\n2487:\t\tnewsk = sk_prot_alloc(prot, priority, sk-\u003esk_family);\n2488:\t\tif (!newsk)\n2489:\t\t\tgoto out;\n2490:\t\n2491:\t\tsock_copy(newsk, sk);\n2492:\t\n2493:\t\tnewsk-\u003esk_prot_creator = prot;\n2494:\t#ifdef CONFIG_BPF_SYSCALL\n2495:\t\tRCU_INIT_POINTER(newsk-\u003esk_bpf_storage, NULL);\n2496:\t#endif\n2497:\t#if IS_ENABLED(CONFIG_INET_PSP)\n2498:\t\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n2499:\t#endif\n2500:\t\n2501:\t\t/* SANITY */\n2502:\t\tif (likely(newsk-\u003esk_net_refcnt)) {\n2503:\t\t\tget_net_track(sock_net(newsk), \u0026newsk-\u003ens_tracker, priority);\n2504:\t\t\tsock_inuse_add(sock_net(newsk), 1);\n2505:\t\t} else {\n2506:\t\t\t/* Kernel sockets are not elevating the struct net refcount.\n2507:\t\t\t * Instead, use a tracker to more easily detect if a layer\n2508:\t\t\t * is not properly dismantling its kernel sockets at netns\n2509:\t\t\t * destroy time.\n2510:\t\t\t */\n2511:\t\t\tnet_passive_inc(sock_net(newsk));\n2512:\t\t\t__netns_tracker_alloc(sock_net(newsk), \u0026newsk-\u003ens_tracker,\n2513:\t\t\t\t\t      false, priority);\n2514:\t\t}\n2515:\t\n2516:\t\tsk_node_init(\u0026newsk-\u003esk_node);\n2517:\t\tsock_lock_init(newsk);\n2518:\t\n2519:\t\tif (lock)\n"
}

{
  "Expression": "INET_PSP"
}

{
  "Output": "drivers/net/ethernet/mellanox/mlx5/core/Kconfig=210=config MLX5_EN_PSP\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig-211-\tbool \"Mellanox Technologies support for PSP cryptography-offload acceleration\"\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig:212:\tdepends on INET_PSP\ndrivers/net/ethernet/mellanox/mlx5/core/Kconfig-213-\tdepends on MLX5_CORE_EN\n--\ndrivers/net/netdevsim/Makefile=19=endif\ndrivers/net/netdevsim/Makefile-20-\ndrivers/net/netdevsim/Makefile:21:ifneq ($(CONFIG_INET_PSP),)\ndrivers/net/netdevsim/Makefile-22-netdevsim-objs += psp.o\n--\ndrivers/net/netdevsim/netdevsim.h=445=static inline void nsim_macsec_teardown(struct netdevsim *ns)\n--\ndrivers/net/netdevsim/netdevsim.h-449-\ndrivers/net/netdevsim/netdevsim.h:450:#if IS_ENABLED(CONFIG_INET_PSP)\ndrivers/net/netdevsim/netdevsim.h-451-int nsim_psp_init(struct netdevsim *ns);\n--\ninclude/linux/netdevice.h=2158=struct net_device {\n--\ninclude/linux/netdevice.h-2388-#endif\ninclude/linux/netdevice.h:2389:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/netdevice.h-2390-\tstruct psp_dev __rcu\t*psp_dev;\n--\ninclude/linux/skbuff.h=5043=enum skb_ext_id {\n--\ninclude/linux/skbuff.h-5058-#endif\ninclude/linux/skbuff.h:5059:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/linux/skbuff.h-5060-\tSKB_EXT_PSP,\n--\ninclude/net/inet_timewait_sock.h=33=struct inet_timewait_sock {\n--\ninclude/net/inet_timewait_sock.h-84-\tstruct inet_bind2_bucket\t*tw_tb2;\ninclude/net/inet_timewait_sock.h:85:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/inet_timewait_sock.h-86-\tstruct psp_assoc __rcu\t  *psp_assoc;\n--\ninclude/net/psp/functions.h=27=static inline void *psp_assoc_drv_data(struct psp_assoc *pas)\n--\ninclude/net/psp/functions.h-31-\ninclude/net/psp/functions.h:32:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/psp/functions.h-33-unsigned int psp_key_size(u32 version);\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-466-#endif\ninclude/net/sock.h:467:#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/sock.h-468-\tstruct psp_assoc __rcu\t*psp_assoc;\n--\nnet/Makefile=20=obj-$(CONFIG_UNIX)\t\t+= unix/\nnet/Makefile:21:obj-$(CONFIG_INET_PSP)\t\t+= psp/\nnet/Makefile-22-obj-y\t\t\t\t+= ipv6/\n--\nnet/core/skbuff.c=5150=static const u8 skb_ext_type_len[] = {\n--\nnet/core/skbuff.c-5165-#endif\nnet/core/skbuff.c:5166:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/skbuff.c-5167-\t[SKB_EXT_PSP] = SKB_EXT_CHUNKSIZEOF(struct psp_skb_ext),\n--\nnet/core/sock.c=2479=struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n--\nnet/core/sock.c-2496-#endif\nnet/core/sock.c:2497:#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/sock.c-2498-\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n--\nnet/psp/Kconfig-4-#\nnet/psp/Kconfig:5:config INET_PSP\nnet/psp/Kconfig-6-\tbool \"PSP Security Protocol support\"\n--\nnet/psp/Makefile-2-\nnet/psp/Makefile:3:obj-$(CONFIG_INET_PSP) += psp.o\nnet/psp/Makefile-4-\n--\ntools/testing/selftests/drivers/net/config=3=CONFIG_DEBUG_INFO_BTF_MODULES=n\ntools/testing/selftests/drivers/net/config:4:CONFIG_INET_PSP=y\ntools/testing/selftests/drivers/net/config-5-CONFIG_IPV6=y\n"
}

{
  "Expression": "psp_assoc"
}

{
  "Output": "drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c=931=struct psp_key {\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-934-\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:935:static int mlx5e_psp_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-936-\t\t\t       struct netlink_ext_ack *extack)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-960-\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:961:static void mlx5e_psp_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-962-{\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c=1011=static struct psp_dev_ops mlx5_psp_ops = {\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1013-\t.rx_spi_alloc = mlx5e_psp_rx_spi_alloc,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:1014:\t.tx_key_add   = mlx5e_psp_assoc_add,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:1015:\t.tx_key_del   = mlx5e_psp_assoc_del,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1016-\t.key_rotate   = mlx5e_psp_key_rotate,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c=93=static bool mlx5e_psp_set_state(struct mlx5e_priv *priv,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c-96-{\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c:97:\tstruct psp_assoc *pas;\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c-98-\tbool ret = false;\n--\ndrivers/net/netdevsim/psp.c=18=nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,\n--\ndrivers/net/netdevsim/psp.c-22-\tstruct psp_dev *peer_psd;\ndrivers/net/netdevsim/psp.c:23:\tstruct psp_assoc *pas;\ndrivers/net/netdevsim/psp.c-24-\tstruct net *net;\n--\ndrivers/net/netdevsim/psp.c-39-\ndrivers/net/netdevsim/psp.c:40:\tptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-41-\tif (*ptr != ns) {\n--\ndrivers/net/netdevsim/psp.c=131=nsim_rx_spi_alloc(struct psp_dev *psd, u32 version,\n--\ndrivers/net/netdevsim/psp.c-151-\ndrivers/net/netdevsim/psp.c:152:static int nsim_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,\ndrivers/net/netdevsim/psp.c-153-\t\t\t  struct netlink_ext_ack *extack)\n--\ndrivers/net/netdevsim/psp.c-155-\tstruct netdevsim *ns = psd-\u003edrv_priv;\ndrivers/net/netdevsim/psp.c:156:\tvoid **ptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-157-\n--\ndrivers/net/netdevsim/psp.c=165=static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)\n--\ndrivers/net/netdevsim/psp.c-179-\ndrivers/net/netdevsim/psp.c:180:static void nsim_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)\ndrivers/net/netdevsim/psp.c-181-{\ndrivers/net/netdevsim/psp.c-182-\tstruct netdevsim *ns = psd-\u003edrv_priv;\ndrivers/net/netdevsim/psp.c:183:\tvoid **ptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-184-\n--\ninclude/net/inet_timewait_sock.h=33=struct inet_timewait_sock {\n--\ninclude/net/inet_timewait_sock.h-85-#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/inet_timewait_sock.h:86:\tstruct psp_assoc __rcu\t  *psp_assoc;\ninclude/net/inet_timewait_sock.h-87-#endif\n--\ninclude/net/psp/functions.h=22=int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv);\n--\ninclude/net/psp/functions.h-24-/* Kernel-facing API */\ninclude/net/psp/functions.h:25:void psp_assoc_put(struct psp_assoc *pas);\ninclude/net/psp/functions.h-26-\ninclude/net/psp/functions.h:27:static inline void *psp_assoc_drv_data(struct psp_assoc *pas)\ninclude/net/psp/functions.h-28-{\n--\ninclude/net/psp/functions.h=37=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb);\ninclude/net/psp/functions.h-38-\ninclude/net/psp/functions.h:39:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-40-{\ninclude/net/psp/functions.h:41:\treturn rcu_dereference_check(sk-\u003epsp_assoc, lockdep_sock_is_held(sk));\ninclude/net/psp/functions.h-42-}\n--\ninclude/net/psp/functions.h=45=psp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb)\ninclude/net/psp/functions.h-46-{\ninclude/net/psp/functions.h:47:\tstruct psp_assoc *pas;\ninclude/net/psp/functions.h-48-\n--\ninclude/net/psp/functions.h=69=static inline bool\ninclude/net/psp/functions.h:70:psp_is_allowed_nondata(struct sk_buff *skb, struct psp_assoc *pas)\ninclude/net/psp/functions.h-71-{\n--\ninclude/net/psp/functions.h=82=static inline bool\ninclude/net/psp/functions.h:83:psp_pse_matches_pas(struct psp_skb_ext *pse, struct psp_assoc *pas)\ninclude/net/psp/functions.h-84-{\n--\ninclude/net/psp/functions.h=91=static inline enum skb_drop_reason\ninclude/net/psp/functions.h:92:__psp_sk_rx_policy_check(struct sk_buff *skb, struct psp_assoc *pas)\ninclude/net/psp/functions.h-93-{\n--\ninclude/net/psp/functions.h=122=psp_twsk_rx_policy_check(struct inet_timewait_sock *tw, struct sk_buff *skb)\ninclude/net/psp/functions.h-123-{\ninclude/net/psp/functions.h:124:\treturn __psp_sk_rx_policy_check(skb, rcu_dereference(tw-\u003epsp_assoc));\ninclude/net/psp/functions.h-125-}\ninclude/net/psp/functions.h-126-\ninclude/net/psp/functions.h:127:static inline struct psp_assoc *psp_sk_get_assoc_rcu(const struct sock *sk)\ninclude/net/psp/functions.h-128-{\ninclude/net/psp/functions.h:129:\tstruct psp_assoc *pas;\ninclude/net/psp/functions.h-130-\tint state;\n--\ninclude/net/psp/functions.h-136-\tpas = state == TCP_TIME_WAIT ?\ninclude/net/psp/functions.h:137:\t\t      rcu_dereference(inet_twsk(sk)-\u003epsp_assoc) :\ninclude/net/psp/functions.h:138:\t\t      rcu_dereference(sk-\u003epsp_assoc);\ninclude/net/psp/functions.h-139-\treturn pas;\n--\ninclude/net/psp/functions.h-141-\ninclude/net/psp/functions.h:142:static inline struct psp_assoc *psp_skb_get_assoc_rcu(struct sk_buff *skb)\ninclude/net/psp/functions.h-143-{\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-152-\tint psp_encap = sizeof(struct udphdr) + PSP_HDR_SIZE + PSP_TRL_SIZE;\ninclude/net/psp/functions.h:153:\tbool has_psp = rcu_access_pointer(sk-\u003epsp_assoc);\ninclude/net/psp/functions.h-154-\n--\ninclude/net/psp/functions.h=163=psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\ninclude/net/psp/functions.h-164-\ninclude/net/psp/functions.h:165:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-166-{\n--\ninclude/net/psp/functions.h=187=psp_twsk_rx_policy_check(struct inet_timewait_sock *tw, struct sk_buff *skb)\n--\ninclude/net/psp/functions.h-191-\ninclude/net/psp/functions.h:192:static inline struct psp_assoc *psp_skb_get_assoc_rcu(struct sk_buff *skb)\ninclude/net/psp/functions.h-193-{\n--\ninclude/net/psp/types.h=43=struct psp_dev_config {\n--\ninclude/net/psp/types.h-53-/**\ninclude/net/psp/types.h:54: * struct psp_assoc_dev - wrapper for associated net_device\ninclude/net/psp/types.h-55- * @dev_list: list node for psp_dev::assoc_dev_list\n--\ninclude/net/psp/types.h-58- */\ninclude/net/psp/types.h:59:struct psp_assoc_dev {\ninclude/net/psp/types.h-60-\tstruct list_head dev_list;\n--\ninclude/net/psp/types.h-67- * @main_netdev: original netdevice of this PSP device\ninclude/net/psp/types.h:68: * @assoc_dev_list: list of psp_assoc_dev entries associated with this PSP device\ninclude/net/psp/types.h-69- * @assoc_dev_cnt: number of entries in @assoc_dev_list\n--\ninclude/net/psp/types.h=124=struct psp_dev_caps {\n--\ninclude/net/psp/types.h-132-\t * @assoc_drv_spc: size of driver-specific state in Tx assoc\ninclude/net/psp/types.h:133:\t * Determines the size of struct psp_assoc::drv_data\ninclude/net/psp/types.h-134-\t */\n--\ninclude/net/psp/types.h=150=struct psp_key_parsed {\n--\ninclude/net/psp/types.h-154-\ninclude/net/psp/types.h:155:struct psp_assoc {\ninclude/net/psp/types.h-156-\tstruct psp_dev *psd;\n--\ninclude/net/psp/types.h=195=struct psp_dev_ops {\n--\ninclude/net/psp/types.h-222-\t */\ninclude/net/psp/types.h:223:\tint (*tx_key_add)(struct psp_dev *psd, struct psp_assoc *pas,\ninclude/net/psp/types.h-224-\t\t\t  struct netlink_ext_ack *extack);\n--\ninclude/net/psp/types.h-228-\t */\ninclude/net/psp/types.h:229:\tvoid (*tx_key_del)(struct psp_dev *psd, struct psp_assoc *pas);\ninclude/net/psp/types.h-230-\n--\ninclude/net/sock.h=242=struct sk_filter;\n--\ninclude/net/sock.h-258-  *\t@sk_policy: flow policy\ninclude/net/sock.h:259:  *\t@psp_assoc: PSP association, if socket is PSP-secured\ninclude/net/sock.h-260-  *\t@sk_receive_queue: incoming packets\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-467-#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/sock.h:468:\tstruct psp_assoc __rcu\t*psp_assoc;\ninclude/net/sock.h-469-#endif\n--\nnet/core/sock.c=2479=struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n--\nnet/core/sock.c-2497-#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/sock.c:2498:\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\nnet/core/sock.c-2499-#endif\n--\nnet/psp/psp-nl-gen.c=71=static const struct genl_split_ops psp_nl_ops[] = {\n--\nnet/psp/psp-nl-gen.c-105-\t\t.cmd\t\t= PSP_CMD_RX_ASSOC,\nnet/psp/psp-nl-gen.c:106:\t\t.pre_doit\t= psp_assoc_device_get_locked,\nnet/psp/psp-nl-gen.c-107-\t\t.doit\t\t= psp_nl_rx_assoc_doit,\n--\nnet/psp/psp-nl-gen.c-114-\t\t.cmd\t\t= PSP_CMD_TX_ASSOC,\nnet/psp/psp-nl-gen.c:115:\t\t.pre_doit\t= psp_assoc_device_get_locked,\nnet/psp/psp-nl-gen.c-116-\t\t.doit\t\t= psp_nl_tx_assoc_doit,\n--\nnet/psp/psp-nl-gen.h=20=int psp_device_get_locked_admin(const struct genl_split_ops *ops,\nnet/psp/psp-nl-gen.h-21-\t\t\t\tstruct sk_buff *skb, struct genl_info *info);\nnet/psp/psp-nl-gen.h:22:int psp_assoc_device_get_locked(const struct genl_split_ops *ops,\nnet/psp/psp-nl-gen.h-23-\t\t\t\tstruct sk_buff *skb, struct genl_info *info);\n--\nnet/psp/psp.h=21=void psp_nl_notify_dev(struct psp_dev *psd, u32 cmd);\nnet/psp/psp.h-22-\nnet/psp/psp.h:23:struct psp_assoc *psp_assoc_create(struct psp_dev *psd);\nnet/psp/psp.h-24-struct psp_dev *psp_dev_get_for_sock(struct sock *sk);\nnet/psp/psp.h:25:void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas);\nnet/psp/psp.h:26:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp.h-27-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp.h=29=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp.h-31-\t\t\t  struct netlink_ext_ack *extack);\nnet/psp/psp.h:32:void psp_assocs_key_rotated(struct psp_dev *psd);\nnet/psp/psp.h-33-\n--\nnet/psp/psp_main.c=131=void psp_dev_unregister(struct psp_dev *psd)\nnet/psp/psp_main.c-132-{\nnet/psp/psp_main.c:133:\tstruct psp_assoc_dev *entry, *entry_tmp;\nnet/psp/psp_main.c:134:\tstruct psp_assoc *pas, *next;\nnet/psp/psp_main.c-135-\n--\nnet/psp/psp_main.c=408=static void psp_dev_disassoc_one(struct psp_dev *psd, struct net_device *dev)\nnet/psp/psp_main.c-409-{\nnet/psp/psp_main.c:410:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_main.c-411-\n--\nnet/psp/psp_nl.c=54=psp_nl_multicast_per_ns(struct psp_dev *psd, unsigned int group,\n--\nnet/psp/psp_nl.c-59-{\nnet/psp/psp_nl.c:60:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-61-\tstruct xarray sent_nets;\n--\nnet/psp/psp_nl.c=230=bool psp_has_assoc_dev_in_ns(struct psp_dev *psd, struct net *net)\nnet/psp/psp_nl.c-231-{\nnet/psp/psp_nl.c:232:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-233-\n--\nnet/psp/psp_nl.c=242=static int psp_nl_fill_assoc_dev_list(struct psp_dev *psd, struct sk_buff *rsp,\n--\nnet/psp/psp_nl.c-245-{\nnet/psp/psp_nl.c:246:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-247-\tstruct net *dev_net_ns;\n--\nnet/psp/psp_nl.c=447=int psp_nl_key_rotate_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-482-\nnet/psp/psp_nl.c:483:\tpsp_assocs_key_rotated(psd);\nnet/psp/psp_nl.c-484-\tpsd-\u003estats.rotations++;\n--\nnet/psp/psp_nl.c=499=int psp_nl_dev_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-501-\tstruct psp_dev *psd = info-\u003euser_ptr[0];\nnet/psp/psp_nl.c:502:\tstruct psp_assoc_dev *psp_assoc_dev;\nnet/psp/psp_nl.c-503-\tstruct net_device *assoc_dev;\n--\nnet/psp/psp_nl.c-518-\nnet/psp/psp_nl.c:519:\tpsp_assoc_dev = kzalloc_obj(*psp_assoc_dev);\nnet/psp/psp_nl.c:520:\tif (!psp_assoc_dev) {\nnet/psp/psp_nl.c-521-\t\terr = -ENOMEM;\n--\nnet/psp/psp_nl.c-526-\tassoc_dev = netdev_get_by_index(net, assoc_ifindex,\nnet/psp/psp_nl.c:527:\t\t\t\t\t\u0026psp_assoc_dev-\u003edev_tracker,\nnet/psp/psp_nl.c-528-\t\t\t\t\tGFP_KERNEL);\n--\nnet/psp/psp_nl.c-543-\nnet/psp/psp_nl.c:544:\tpsp_assoc_dev-\u003eassoc_dev = assoc_dev;\nnet/psp/psp_nl.c-545-\n--\nnet/psp/psp_nl.c-563-\nnet/psp/psp_nl.c:564:\tlist_add_tail(\u0026psp_assoc_dev-\u003edev_list, \u0026psd-\u003eassoc_dev_list);\nnet/psp/psp_nl.c-565-\tpsd-\u003eassoc_dev_cnt++;\n--\nnet/psp/psp_nl.c-575-err_put_dev:\nnet/psp/psp_nl.c:576:\tnetdev_put(assoc_dev, \u0026psp_assoc_dev-\u003edev_tracker);\nnet/psp/psp_nl.c-577-err_free_assoc:\nnet/psp/psp_nl.c:578:\tkfree(psp_assoc_dev);\nnet/psp/psp_nl.c-579-err_put_net:\n--\nnet/psp/psp_nl.c=585=int psp_nl_dev_disassoc_doit(struct sk_buff *skb, struct genl_info *info)\nnet/psp/psp_nl.c-586-{\nnet/psp/psp_nl.c:587:\tstruct psp_assoc_dev *entry, *found = NULL;\nnet/psp/psp_nl.c-588-\tstruct psp_dev *psd = info-\u003euser_ptr[0];\n--\nnet/psp/psp_nl.c-638-\nnet/psp/psp_nl.c:639:int psp_assoc_device_get_locked(const struct genl_split_ops *ops,\nnet/psp/psp_nl.c-640-\t\t\t\tstruct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c=770=int psp_nl_rx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-774-\tstruct psp_key_parsed key;\nnet/psp/psp_nl.c:775:\tstruct psp_assoc *pas;\nnet/psp/psp_nl.c-776-\tstruct sk_buff *rsp;\n--\nnet/psp/psp_nl.c-792-\nnet/psp/psp_nl.c:793:\tpas = psp_assoc_create(psd);\nnet/psp/psp_nl.c-794-\tif (!pas) {\n--\nnet/psp/psp_nl.c-814-\t}\nnet/psp/psp_nl.c:815:\tpsp_assoc_put(pas);\nnet/psp/psp_nl.c-816-\n--\nnet/psp/psp_nl.c-819-err_free_pas:\nnet/psp/psp_nl.c:820:\tpsp_assoc_put(pas);\nnet/psp/psp_nl.c-821-err_free_rsp:\n--\nnet/psp/psp_sock.c=30=psp_validate_xmit(struct sock *sk, struct net_device *dev, struct sk_buff *skb)\nnet/psp/psp_sock.c-31-{\nnet/psp/psp_sock.c:32:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-33-\tbool good;\n--\nnet/psp/psp_sock.c-46-\nnet/psp/psp_sock.c:47:struct psp_assoc *psp_assoc_create(struct psp_dev *psd)\nnet/psp/psp_sock.c-48-{\nnet/psp/psp_sock.c:49:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-50-\n--\nnet/psp/psp_sock.c-68-\nnet/psp/psp_sock.c:69:static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)\nnet/psp/psp_sock.c-70-{\n--\nnet/psp/psp_sock.c-79-\nnet/psp/psp_sock.c:80:static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\nnet/psp/psp_sock.c-81-\t\t\t      struct netlink_ext_ack *extack)\n--\nnet/psp/psp_sock.c-85-\nnet/psp/psp_sock.c:86:void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)\nnet/psp/psp_sock.c-87-{\n--\nnet/psp/psp_sock.c-92-\nnet/psp/psp_sock.c:93:static void psp_assoc_free(struct work_struct *work)\nnet/psp/psp_sock.c-94-{\nnet/psp/psp_sock.c:95:\tstruct psp_assoc *pas = container_of(work, struct psp_assoc, work);\nnet/psp/psp_sock.c-96-\tstruct psp_dev *psd = pas-\u003epsd;\n--\nnet/psp/psp_sock.c-105-\nnet/psp/psp_sock.c:106:static void psp_assoc_free_queue(struct rcu_head *head)\nnet/psp/psp_sock.c-107-{\nnet/psp/psp_sock.c:108:\tstruct psp_assoc *pas = container_of(head, struct psp_assoc, rcu);\nnet/psp/psp_sock.c-109-\nnet/psp/psp_sock.c:110:\tINIT_WORK(\u0026pas-\u003ework, psp_assoc_free);\nnet/psp/psp_sock.c-111-\tschedule_work(\u0026pas-\u003ework);\n--\nnet/psp/psp_sock.c-114-/**\nnet/psp/psp_sock.c:115: * psp_assoc_put() - release a reference on a PSP association\nnet/psp/psp_sock.c-116- * @pas: association to release\nnet/psp/psp_sock.c-117- */\nnet/psp/psp_sock.c:118:void psp_assoc_put(struct psp_assoc *pas)\nnet/psp/psp_sock.c-119-{\nnet/psp/psp_sock.c-120-\tif (pas \u0026\u0026 refcount_dec_and_test(\u0026pas-\u003erefcnt))\nnet/psp/psp_sock.c:121:\t\tcall_rcu(\u0026pas-\u003ercu, psp_assoc_free_queue);\nnet/psp/psp_sock.c-122-}\n--\nnet/psp/psp_sock.c=124=void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\nnet/psp/psp_sock.c:126:\tstruct psp_assoc *pas = rcu_dereference_protected(sk-\u003epsp_assoc, 1);\nnet/psp/psp_sock.c-127-\nnet/psp/psp_sock.c:128:\trcu_assign_pointer(sk-\u003epsp_assoc, NULL);\nnet/psp/psp_sock.c:129:\tpsp_assoc_put(pas);\nnet/psp/psp_sock.c-130-}\nnet/psp/psp_sock.c-131-\nnet/psp/psp_sock.c:132:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp_sock.c-133-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp_sock.c-148-\trefcount_inc(\u0026pas-\u003erefcnt);\nnet/psp/psp_sock.c:149:\trcu_assign_pointer(sk-\u003epsp_assoc, pas);\nnet/psp/psp_sock.c-150-\terr = 0;\n--\nnet/psp/psp_sock.c-157-\nnet/psp/psp_sock.c:158:static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\nnet/psp/psp_sock.c-159-{\n--\nnet/psp/psp_sock.c=177=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp_sock.c-181-\tstruct inet_connection_sock *icsk;\nnet/psp/psp_sock.c:182:\tstruct psp_assoc *pas, *dummy;\nnet/psp/psp_sock.c-183-\tint err;\n--\nnet/psp/psp_sock.c-219-\t */\nnet/psp/psp_sock.c:220:\tdummy = psp_assoc_dummy(pas);\nnet/psp/psp_sock.c-221-\tif (!dummy) {\n--\nnet/psp/psp_sock.c-248-\nnet/psp/psp_sock.c:249:void psp_assocs_key_rotated(struct psp_dev *psd)\nnet/psp/psp_sock.c-250-{\nnet/psp/psp_sock.c:251:\tstruct psp_assoc *pas, *next;\nnet/psp/psp_sock.c-252-\n--\nnet/psp/psp_sock.c=266=void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk)\nnet/psp/psp_sock.c-267-{\nnet/psp/psp_sock.c:268:\tstruct psp_assoc *pas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-269-\n--\nnet/psp/psp_sock.c-271-\t\trefcount_inc(\u0026pas-\u003erefcnt);\nnet/psp/psp_sock.c:272:\trcu_assign_pointer(tw-\u003epsp_assoc, pas);\nnet/psp/psp_sock.c-273-\ttw-\u003etw_validate_xmit_skb = psp_validate_xmit;\n--\nnet/psp/psp_sock.c=276=void psp_twsk_assoc_free(struct inet_timewait_sock *tw)\nnet/psp/psp_sock.c-277-{\nnet/psp/psp_sock.c:278:\tstruct psp_assoc *pas = rcu_dereference_protected(tw-\u003epsp_assoc, 1);\nnet/psp/psp_sock.c-279-\nnet/psp/psp_sock.c:280:\trcu_assign_pointer(tw-\u003epsp_assoc, NULL);\nnet/psp/psp_sock.c:281:\tpsp_assoc_put(pas);\nnet/psp/psp_sock.c-282-}\n--\nnet/psp/psp_sock.c=284=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb)\nnet/psp/psp_sock.c-285-{\nnet/psp/psp_sock.c:286:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-287-\n--\ntools/testing/selftests/drivers/net/psp.py=606=def _check_assoc_list(cfg, psp_dev_id, ifindex, nsid=None):\n--\ntools/testing/selftests/drivers/net/psp.py-623-\ntools/testing/selftests/drivers/net/psp.py:624:def _data_basic_send_netkit_psp_assoc(cfg, version, ipver):\ntools/testing/selftests/drivers/net/psp.py-625-    \"\"\"\n--\ntools/testing/selftests/drivers/net/psp.py=659=def _get_psp_ver_ip6_variants():\n--\ntools/testing/selftests/drivers/net/psp.py-664-@ksft_variants(_get_psp_ver_ip6_variants())\ntools/testing/selftests/drivers/net/psp.py:665:def data_basic_send_netkit_psp_assoc(cfg, version, ipver):\ntools/testing/selftests/drivers/net/psp.py-666-    \"\"\"Test PSP data send via netkit with dev-assoc.\"\"\"\ntools/testing/selftests/drivers/net/psp.py-667-    cfg.require_ipver(ipver)\ntools/testing/selftests/drivers/net/psp.py:668:    _data_basic_send_netkit_psp_assoc(cfg, version, ipver)\ntools/testing/selftests/drivers/net/psp.py-669-\n--\ntools/testing/selftests/drivers/net/psp.py=698=def _dev_change_notify_multi_ns_netkit(cfg):\n--\ntools/testing/selftests/drivers/net/psp.py-725-\ntools/testing/selftests/drivers/net/psp.py:726:def _psp_dev_get_check_netkit_psp_assoc(cfg):\ntools/testing/selftests/drivers/net/psp.py-727-    \"\"\" Check psp dev-get output with netkit interface associated with PSP dev \"\"\"\n--\ntools/testing/selftests/drivers/net/psp.py=941=def main() -\u003e None:\n--\ntools/testing/selftests/drivers/net/psp.py-980-                        _assoc_check_list,\ntools/testing/selftests/drivers/net/psp.py:981:                        data_basic_send_netkit_psp_assoc,\ntools/testing/selftests/drivers/net/psp.py-982-                        _key_rotation_notify_multi_ns_netkit,\ntools/testing/selftests/drivers/net/psp.py-983-                        _dev_change_notify_multi_ns_netkit,\ntools/testing/selftests/drivers/net/psp.py:984:                        _psp_dev_get_check_netkit_psp_assoc,\ntools/testing/selftests/drivers/net/psp.py-985-                        _dev_assoc_no_nsid,\n"
}

gemini-3.7-flash

null

null

							input: 13643
							output: 32
							thoughts: 15
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Diving into the Kconfig of net/psp**

Okay, time to get a handle on what's going on in the `net/psp` subsystem. My usual approach – start with the Kconfig. That file is the foundation, right? It'll lay out the available configuration options, dependencies, and their default values. I need to understand what variables are at play here. Figure out what features are configurable, how they interrelate, and what the baseline setup looks like. This is where I'll get the lay of the land, the core design decisions made by the original authors, and start to formulate a mental model of this part of the network stack. So, let's crack open `net/psp/Kconfig` and see what gems it holds.

{
  "File": "net/psp/Kconfig",
  "FirstLine": 1,
  "LineCount": 50
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# PSP configuration\n   4:\t#\n   5:\tconfig INET_PSP\n   6:\t\tbool \"PSP Security Protocol support\"\n   7:\t\tdepends on INET\n   8:\t\tselect SKB_DECRYPTED\n   9:\t\tselect SKB_EXTENSIONS\n  10:\t\tselect SOCK_VALIDATE_XMIT\n  11:\t\thelp\n  12:\t\tEnable kernel support for the PSP Security Protocol (PSP).\n  13:\t\tFor more information see:\n  14:\t\t  https://raw.githubusercontent.com/google/psp/main/doc/PSP_Arch_Spec.pdf\n  15:\t\n  16:\t\tIf unsure, say N.\n"
}

gemini-3.7-flash

null

null

							input: 14075
							output: 19
							thoughts: 19
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the Commit's Context**

Okay, so I need to get a handle on this patch. My immediate thought is to reach for `git log`. I need to see the commit history directly. Forget trying to decipher the diff alone; I want the broader context. What led to this change? What's the narrative around it? I need to understand *why* this was done, not just *what* was changed. The commit message itself is a starting point, of course, but often it only tells part of the story. I'm looking for the "so what?" behind the "what." Give me the commit log so I can see the bigger picture.

no matches

{
  "Expression": "sk_clone.*psp"
}

{
  "error": "no matches"
}

gemini-3.7-flash

null

null

							input: 14285
							output: 17
							thoughts: 41
						

Okay, let's dive into this. I need to understand the relationship between `sk_clone` and how the `psp_assoc` is handled, especially within the context of socket allocation and cloning. My goal is to map out where these interactions occur in the socket creation and duplication process.

Specifically, I need to investigate the function `sk_clone` and pinpoint its callers. This will shed light on the exact sequence of events and how the association, or lack thereof, with the `psp_assoc` variable is managed when sockets are created and subsequently cloned. This investigation will allow me to track the lifecycle of this association and identify any potential pitfalls in the socket duplication process. I'm focusing on tracing this `psp_assoc` through the call graph.

{
  "Expression": "sk_clone"
}

{
  "Output": "\nFull output is too long, showing 500 out of 574 lines.\nUse more precise expression if possible.\n\nDocumentation/security/SCTP.rst=13=For security module support, three SCTP specific hooks have been implemented::\n--\nDocumentation/security/SCTP.rst-16-    security_sctp_bind_connect()\nDocumentation/security/SCTP.rst:17:    security_sctp_sk_clone()\nDocumentation/security/SCTP.rst-18-    security_sctp_assoc_established()\n--\nDocumentation/security/SCTP.rst=102=ASCONF chunk when the corresponding ``@optname``'s are present::\n--\nDocumentation/security/SCTP.rst-109-\nDocumentation/security/SCTP.rst:110:security_sctp_sk_clone()\nDocumentation/security/SCTP.rst-111-~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/security/SCTP.rst=136=establishing an association.\n--\nDocumentation/security/SCTP.rst-176-          |                               If SCTP_SOCKET_TCP or peeled off\nDocumentation/security/SCTP.rst:177:          |                               socket security_sctp_sk_clone() is\nDocumentation/security/SCTP.rst-178-          |                               called to clone the new socket.\n--\nDocumentation/security/SCTP.rst=194=hooks with the SELinux specifics expanded below::\n--\nDocumentation/security/SCTP.rst-197-    security_sctp_bind_connect()\nDocumentation/security/SCTP.rst:198:    security_sctp_sk_clone()\nDocumentation/security/SCTP.rst-199-    security_sctp_assoc_established()\n--\nDocumentation/security/SCTP.rst=255=Reconfiguration is enabled.\n--\nDocumentation/security/SCTP.rst-257-\nDocumentation/security/SCTP.rst:258:security_sctp_sk_clone()\nDocumentation/security/SCTP.rst-259-~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/security/SCTP.rst=261=socket) or when a socket is 'peeled off' e.g userspace calls\nDocumentation/security/SCTP.rst:262:**sctp_peeloff**\\(3). ``security_sctp_sk_clone()`` will set the new\nDocumentation/security/SCTP.rst-263-sockets sid and peer sid to that contained in the ``@asoc sid`` and\n--\nDocumentation/translations/zh_CN/security/SCTP.rst=13=SCTP的LSM支持\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-22-\tsecurity_sctp_bind_connect()\nDocumentation/translations/zh_CN/security/SCTP.rst:23:\tsecurity_sctp_sk_clone()\nDocumentation/translations/zh_CN/security/SCTP.rst-24-\tsecurity_sctp_assoc_established()\n--\nDocumentation/translations/zh_CN/security/SCTP.rst=39=security_sctp_bind_connect()\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-106-\nDocumentation/translations/zh_CN/security/SCTP.rst:107:security_sctp_sk_clone()\nDocumentation/translations/zh_CN/security/SCTP.rst-108-~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/translations/zh_CN/security/SCTP.rst=118=security_sctp_assoc_established()\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-166-          |                               如果是SCTP_SOCKET_TCP或是剥离的套接\nDocumentation/translations/zh_CN/security/SCTP.rst:167:          |                               字，会调用 security_sctp_sk_clone()\nDocumentation/translations/zh_CN/security/SCTP.rst-168-          |                               来克隆新的套接字。\n--\nDocumentation/translations/zh_CN/security/SCTP.rst=177=SCTP的SELinux支持\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-187-\tsecurity_sctp_bind_connect()\nDocumentation/translations/zh_CN/security/SCTP.rst:188:\tsecurity_sctp_sk_clone()\nDocumentation/translations/zh_CN/security/SCTP.rst-189-\tsecurity_sctp_assoc_established()\n--\nDocumentation/translations/zh_CN/security/SCTP.rst=216=security_sctp_bind_connect()\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-243-\nDocumentation/translations/zh_CN/security/SCTP.rst:244:security_sctp_sk_clone()\nDocumentation/translations/zh_CN/security/SCTP.rst-245-~~~~~~~~~~~~~~~~~~~~~~~~\n--\nDocumentation/translations/zh_CN/security/SCTP.rst-247-当一个套接字被“剥离”如用户空间调用 **sctp_peeloff**\\(3)时，\nDocumentation/translations/zh_CN/security/SCTP.rst:248:``security_sctp_sk_clone()`` 将会分别将新套接字的sid和对端sid设置为\nDocumentation/translations/zh_CN/security/SCTP.rst-249-``@asoc sid`` 和 ``@asoc peer sid`` 中包含的值。\n--\ncrypto/af_alg.c=464=int af_alg_accept(struct sock *sk, struct socket *newsock,\n--\ncrypto/af_alg.c-486-\tsecurity_sock_graft(sk2, newsock);\ncrypto/af_alg.c:487:\tsecurity_sk_clone(sk, sk2);\ncrypto/af_alg.c-488-\n--\ninclude/linux/cgroup.h=909=void cgroup_sk_alloc(struct sock_cgroup_data *skcd);\ninclude/linux/cgroup.h:910:void cgroup_sk_clone(struct sock_cgroup_data *skcd);\ninclude/linux/cgroup.h-911-void cgroup_sk_free(struct sock_cgroup_data *skcd);\n--\ninclude/linux/cgroup.h=920=static inline void cgroup_sk_alloc(struct sock_cgroup_data *skcd) {}\ninclude/linux/cgroup.h:921:static inline void cgroup_sk_clone(struct sock_cgroup_data *skcd) {}\ninclude/linux/cgroup.h-922-static inline void cgroup_sk_free(struct sock_cgroup_data *skcd) {}\n--\ninclude/linux/lsm_hook_defs.h=359=LSM_HOOK(void, LSM_RET_VOID, sk_free_security, struct sock *sk)\ninclude/linux/lsm_hook_defs.h:360:LSM_HOOK(void, LSM_RET_VOID, sk_clone_security, const struct sock *sk,\ninclude/linux/lsm_hook_defs.h-361-\t struct sock *newsk)\n--\ninclude/linux/lsm_hook_defs.h=364=LSM_HOOK(int, 0, inet_conn_request, const struct sock *sk, struct sk_buff *skb,\ninclude/linux/lsm_hook_defs.h-365-\t struct request_sock *req)\ninclude/linux/lsm_hook_defs.h:366:LSM_HOOK(void, LSM_RET_VOID, inet_csk_clone, struct sock *newsk,\ninclude/linux/lsm_hook_defs.h-367-\t const struct request_sock *req)\n--\ninclude/linux/lsm_hook_defs.h=382=LSM_HOOK(int, 0, sctp_bind_connect, struct sock *sk, int optname,\ninclude/linux/lsm_hook_defs.h-383-\t struct sockaddr *address, int addrlen)\ninclude/linux/lsm_hook_defs.h:384:LSM_HOOK(void, LSM_RET_VOID, sctp_sk_clone, struct sctp_association *asoc,\ninclude/linux/lsm_hook_defs.h-385-\t struct sock *sk, struct sock *newsk)\n--\ninclude/linux/security.h=1689=void security_sk_free(struct sock *sk);\ninclude/linux/security.h:1690:void security_sk_clone(const struct sock *sk, struct sock *newsk);\ninclude/linux/security.h-1691-void security_sk_classify_flow(const struct sock *sk,\n--\ninclude/linux/security.h=1696=int security_inet_conn_request(const struct sock *sk,\ninclude/linux/security.h-1697-\t\t\tstruct sk_buff *skb, struct request_sock *req);\ninclude/linux/security.h:1698:void security_inet_csk_clone(struct sock *newsk,\ninclude/linux/security.h-1699-\t\t\tconst struct request_sock *req);\n--\ninclude/linux/security.h=1712=int security_sctp_bind_connect(struct sock *sk, int optname,\ninclude/linux/security.h-1713-\t\t\t       struct sockaddr *address, int addrlen);\ninclude/linux/security.h:1714:void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,\ninclude/linux/security.h-1715-\t\t\t    struct sock *newsk);\n--\ninclude/linux/security.h=1847=static inline void security_sk_free(struct sock *sk)\n--\ninclude/linux/security.h-1850-\ninclude/linux/security.h:1851:static inline void security_sk_clone(const struct sock *sk, struct sock *newsk)\ninclude/linux/security.h-1852-{\n--\ninclude/linux/security.h=1869=static inline int security_inet_conn_request(const struct sock *sk,\n--\ninclude/linux/security.h-1874-\ninclude/linux/security.h:1875:static inline void security_inet_csk_clone(struct sock *newsk,\ninclude/linux/security.h-1876-\t\t\tconst struct request_sock *req)\n--\ninclude/linux/security.h=1933=static inline int security_sctp_bind_connect(struct sock *sk, int optname,\n--\ninclude/linux/security.h-1939-\ninclude/linux/security.h:1940:static inline void security_sctp_sk_clone(struct sctp_association *asoc,\ninclude/linux/security.h-1941-\t\t\t\t\t  struct sock *sk,\n--\ninclude/net/inet_connection_sock.h=153=static inline void *inet_csk_ca(const struct sock *sk)\n--\ninclude/net/inet_connection_sock.h-157-\ninclude/net/inet_connection_sock.h:158:struct sock *inet_csk_clone_lock(const struct sock *sk,\ninclude/net/inet_connection_sock.h-159-\t\t\t\t const struct request_sock *req,\n--\ninclude/net/sctp/structs.h=1547=struct sctp_association {\n--\ninclude/net/sctp/structs.h-2079-\t * SCTP TCP type sockets and peeled off connections as they\ninclude/net/sctp/structs.h:2080:\t * cause a new socket to be generated. security_sctp_sk_clone()\ninclude/net/sctp/structs.h-2081-\t * will then plug these into the new socket.\n--\ninclude/net/sock.h=1843=void sk_destruct(struct sock *sk);\ninclude/net/sock.h:1844:struct sock *sk_clone(const struct sock *sk, const gfp_t priority, bool lock);\ninclude/net/sock.h-1845-\ninclude/net/sock.h:1846:static inline struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)\ninclude/net/sock.h-1847-{\ninclude/net/sock.h:1848:\treturn sk_clone(sk, priority, true);\ninclude/net/sock.h-1849-}\n--\ninclude/net/xfrm.h=1386=static inline int xfrm6_route_forward(struct sk_buff *skb)\n--\ninclude/net/xfrm.h-1390-\ninclude/net/xfrm.h:1391:int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk);\ninclude/net/xfrm.h-1392-\ninclude/net/xfrm.h:1393:static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)\ninclude/net/xfrm.h-1394-{\n--\ninclude/net/xfrm.h-1399-\tif (unlikely(osk-\u003esk_policy[0] || osk-\u003esk_policy[1]))\ninclude/net/xfrm.h:1400:\t\treturn __xfrm_sk_clone_policy(sk, osk);\ninclude/net/xfrm.h-1401-\treturn 0;\n--\ninclude/net/xfrm.h=1424=static inline void xfrm_sk_free_policy(struct sock *sk) {}\ninclude/net/xfrm.h:1425:static inline int xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk) { return 0; }\ninclude/net/xfrm.h-1426-static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }\n--\nkernel/bpf/bpf_lsm.c=76=BTF_ID(func, bpf_lsm_sock_graft)\nkernel/bpf/bpf_lsm.c:77:BTF_ID(func, bpf_lsm_inet_csk_clone)\nkernel/bpf/bpf_lsm.c-78-BTF_ID(func, bpf_lsm_inet_conn_established)\n--\nkernel/cgroup/cgroup.c=7493=void cgroup_sk_alloc(struct sock_cgroup_data *skcd)\n--\nkernel/cgroup/cgroup.c-7520-\nkernel/cgroup/cgroup.c:7521:void cgroup_sk_clone(struct sock_cgroup_data *skcd)\nkernel/cgroup/cgroup.c-7522-{\n--\nnet/bluetooth/iso.c=955=static void iso_sock_init(struct sock *sk, struct sock *parent)\n--\nnet/bluetooth/iso.c-961-\t\tbt_sk(sk)-\u003eflags = bt_sk(parent)-\u003eflags;\nnet/bluetooth/iso.c:962:\t\tsecurity_sk_clone(parent, sk);\nnet/bluetooth/iso.c-963-\t}\n--\nnet/bluetooth/l2cap_sock.c=1967=static void l2cap_sock_init(struct sock *sk, struct sock *parent)\n--\nnet/bluetooth/l2cap_sock.c-1979-\t\t */\nnet/bluetooth/l2cap_sock.c:1980:\t\tsecurity_sk_clone(parent, sk);\nnet/bluetooth/l2cap_sock.c-1981-\t} else {\n--\nnet/bluetooth/rfcomm/sock.c=250=static void rfcomm_sock_init(struct sock *sk, struct sock *parent)\n--\nnet/bluetooth/rfcomm/sock.c-263-\nnet/bluetooth/rfcomm/sock.c:264:\t\tsecurity_sk_clone(parent, sk);\nnet/bluetooth/rfcomm/sock.c-265-\t} else {\n--\nnet/bluetooth/sco.c=596=static void sco_sock_init(struct sock *sk, struct sock *parent)\n--\nnet/bluetooth/sco.c-602-\t\tbt_sk(sk)-\u003eflags = bt_sk(parent)-\u003eflags;\nnet/bluetooth/sco.c:603:\t\tsecurity_sk_clone(parent, sk);\nnet/bluetooth/sco.c-604-\t}\n--\nnet/core/sock.c=2209=static void sock_copy(struct sock *nsk, const struct sock *osk)\n--\nnet/core/sock.c-2217-\t * we must check if sk_tx_queue_clear() is called after\nnet/core/sock.c:2218:\t * sock_copy() in sk_clone_lock().\nnet/core/sock.c-2219-\t */\n--\nnet/core/sock.c-2232-\tnsk-\u003esk_security = sptr;\nnet/core/sock.c:2233:\tsecurity_sk_clone(osk, nsk);\nnet/core/sock.c-2234-#endif\n--\nnet/core/sock.c=2444=static void sk_init_common(struct sock *sk)\n--\nnet/core/sock.c-2470-/**\nnet/core/sock.c:2471: * sk_clone - clone a socket\nnet/core/sock.c-2472- * @sk: the socket to clone\n--\nnet/core/sock.c-2478- */\nnet/core/sock.c:2479:struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\nnet/core/sock.c-2480-\t\t      bool lock)\n--\nnet/core/sock.c-2549-\nnet/core/sock.c:2550:\tcgroup_sk_clone(\u0026newsk-\u003esk_cgrp_data);\nnet/core/sock.c-2551-\n--\nnet/core/sock.c-2567-\nnet/core/sock.c:2568:\tif (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {\nnet/core/sock.c-2569-\t\t/* We need to make sure that we don't uncharge the new\n--\nnet/core/sock.c-2618-}\nnet/core/sock.c:2619:EXPORT_SYMBOL_GPL(sk_clone);\nnet/core/sock.c-2620-\n--\nnet/ipv4/inet_connection_sock.c=904=void __reqsk_free(struct request_sock *req)\n--\nnet/ipv4/inet_connection_sock.c-912-\nnet/ipv4/inet_connection_sock.c:913:static struct request_sock *inet_reqsk_clone(struct request_sock *req,\nnet/ipv4/inet_connection_sock.c-914-\t\t\t\t\t     struct sock *sk)\n--\nnet/ipv4/inet_connection_sock.c=1033=static void reqsk_timer_handler(struct timer_list *t)\n--\nnet/ipv4/inet_connection_sock.c-1049-\nnet/ipv4/inet_connection_sock.c:1050:\t\tnreq = inet_reqsk_clone(req, nsk);\nnet/ipv4/inet_connection_sock.c-1051-\t\tif (!nreq)\n--\nnet/ipv4/inet_connection_sock.c=1185=static void inet_clone_ulp(const struct request_sock *req, struct sock *newsk,\n--\nnet/ipv4/inet_connection_sock.c-1196-/**\nnet/ipv4/inet_connection_sock.c:1197: *\tinet_csk_clone_lock - clone an inet socket, and lock its clone\nnet/ipv4/inet_connection_sock.c-1198- *\t@sk: the socket to clone\n--\nnet/ipv4/inet_connection_sock.c-1203- */\nnet/ipv4/inet_connection_sock.c:1204:struct sock *inet_csk_clone_lock(const struct sock *sk,\nnet/ipv4/inet_connection_sock.c-1205-\t\t\t\t const struct request_sock *req,\n--\nnet/ipv4/inet_connection_sock.c-1207-{\nnet/ipv4/inet_connection_sock.c:1208:\tstruct sock *newsk = sk_clone_lock(sk, priority);\nnet/ipv4/inet_connection_sock.c-1209-\tstruct inet_connection_sock *newicsk;\n--\nnet/ipv4/inet_connection_sock.c-1259-\nnet/ipv4/inet_connection_sock.c:1260:\tsecurity_inet_csk_clone(newsk, req);\nnet/ipv4/inet_connection_sock.c-1261-\n--\nnet/ipv4/inet_connection_sock.c=1304=void inet_csk_prepare_forced_close(struct sock *sk)\n--\nnet/ipv4/inet_connection_sock.c-1306-{\nnet/ipv4/inet_connection_sock.c:1307:\t/* sk_clone_lock locked the socket and set refcnt to 2 */\nnet/ipv4/inet_connection_sock.c-1308-\tbh_unlock_sock(sk);\n--\nnet/ipv4/inet_connection_sock.c=1417=struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,\n--\nnet/ipv4/inet_connection_sock.c-1430-\t\t\t/* hold a refcnt for the nreq-\u003ersk_listener\nnet/ipv4/inet_connection_sock.c:1431:\t\t\t * which is assigned in inet_reqsk_clone()\nnet/ipv4/inet_connection_sock.c-1432-\t\t\t */\nnet/ipv4/inet_connection_sock.c-1433-\t\t\tsock_hold(sk);\nnet/ipv4/inet_connection_sock.c:1434:\t\t\tnreq = inet_reqsk_clone(req, sk);\nnet/ipv4/inet_connection_sock.c-1435-\t\t\tif (!nreq) {\n--\nnet/ipv4/inet_connection_sock.c=1466=void inet_csk_listen_stop(struct sock *sk)\n--\nnet/ipv4/inet_connection_sock.c-1490-\t\tif (nsk) {\nnet/ipv4/inet_connection_sock.c:1491:\t\t\tnreq = inet_reqsk_clone(req, nsk);\nnet/ipv4/inet_connection_sock.c-1492-\t\t\tif (nreq) {\n--\nnet/ipv4/tcp_bpf.c=725=int tcp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore)\n--\nnet/ipv4/tcp_bpf.c-744-\t\t\tWRITE_ONCE(sk-\u003esk_write_space, psock-\u003esaved_write_space);\nnet/ipv4/tcp_bpf.c:745:\t\t\t/* Pairs with lockless read in sk_clone_lock() */\nnet/ipv4/tcp_bpf.c-746-\t\t\tsock_replace_proto(sk, psock-\u003esk_proto);\n--\nnet/ipv4/tcp_bpf.c-757-\nnet/ipv4/tcp_bpf.c:758:\t/* Pairs with lockless read in sk_clone_lock() */\nnet/ipv4/tcp_bpf.c-759-\tsock_replace_proto(sk, \u0026tcp_bpf_prots[family][config]);\n--\nnet/ipv4/tcp_ipv4.c=717=static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb,\n--\nnet/ipv4/tcp_ipv4.c-878-\t\ttransmit_time = tcp_transmit_time(sk);\nnet/ipv4/tcp_ipv4.c:879:\t\txfrm_sk_clone_policy(ctl_sk, sk);\nnet/ipv4/tcp_ipv4.c-880-\t\ttxhash = (sk-\u003esk_state == TCP_TIME_WAIT) ?\n--\nnet/ipv4/tcp_minisocks.c=546=struct sock *tcp_create_openreq_child(const struct sock *sk,\n--\nnet/ipv4/tcp_minisocks.c-549-{\nnet/ipv4/tcp_minisocks.c:550:\tstruct sock *newsk = inet_csk_clone_lock(sk, req, GFP_ATOMIC);\nnet/ipv4/tcp_minisocks.c-551-\tconst struct inet_request_sock *ireq = inet_rsk(req);\n--\nnet/iucv/af_iucv.c=458=static void iucv_sock_init(struct sock *sk, struct sock *parent)\n--\nnet/iucv/af_iucv.c-461-\t\tsk-\u003esk_type = parent-\u003esk_type;\nnet/iucv/af_iucv.c:462:\t\tsecurity_sk_clone(parent, sk);\nnet/iucv/af_iucv.c-463-\t}\n--\nnet/mptcp/protocol.c=3675=static void mptcp_copy_ip_options(struct sock *newsk, const struct sock *sk)\n--\nnet/mptcp/protocol.c-3694-\nnet/mptcp/protocol.c:3695:struct sock *mptcp_sk_clone_init(const struct sock *sk,\nnet/mptcp/protocol.c-3696-\t\t\t\t const struct mptcp_options_received *mp_opt,\n--\nnet/mptcp/protocol.c-3700-\tstruct mptcp_subflow_request_sock *subflow_req = mptcp_subflow_rsk(req);\nnet/mptcp/protocol.c:3701:\tstruct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC);\nnet/mptcp/protocol.c-3702-\tstruct mptcp_subflow_context *subflow;\n--\nnet/mptcp/protocol.c-3740-\tsock_reset_flag(nsk, SOCK_RCU_FREE);\nnet/mptcp/protocol.c:3741:\tsecurity_inet_csk_clone(nsk, req);\nnet/mptcp/protocol.c-3742-\n--\nnet/mptcp/protocol.h=920=void __init mptcp_subflow_v6_init(void);\n--\nnet/mptcp/protocol.h-922-\nnet/mptcp/protocol.h:923:struct sock *mptcp_sk_clone_init(const struct sock *sk,\nnet/mptcp/protocol.h-924-\t\t\t\t const struct mptcp_options_received *mp_opt,\n--\nnet/mptcp/subflow.c=804=static struct sock *subflow_syn_recv_sock(const struct sock *sk,\n--\nnet/mptcp/subflow.c-886-\t\tif (ctx-\u003emp_capable) {\nnet/mptcp/subflow.c:887:\t\t\tctx-\u003econn = mptcp_sk_clone_init(listener-\u003econn, \u0026mp_opt, child, req);\nnet/mptcp/subflow.c-888-\t\t\tif (!ctx-\u003econn)\n--\nnet/mptcp/subflow.c=1738=void __mptcp_inherit_cgrp_data(struct sock *sk, struct sock *ssk)\n--\nnet/mptcp/subflow.c-1748-\t\t*ssk_cd = *sk_cd;\nnet/mptcp/subflow.c:1749:\t\tcgroup_sk_clone(sk_cd);\nnet/mptcp/subflow.c-1750-\t}\n--\nnet/sctp/socket.c=4856=static struct sock *sctp_clone_sock(struct sock *sk,\n--\nnet/sctp/socket.c-4859-{\nnet/sctp/socket.c:4860:\tstruct sock *newsk = sk_clone(sk, GFP_KERNEL, false);\nnet/sctp/socket.c-4861-\tstruct inet_sock *newinet;\n--\nnet/sctp/socket.c-4867-\nnet/sctp/socket.c:4868:\t/* sk_clone() sets refcnt to 2 and increments sockets_allocated */\nnet/sctp/socket.c-4869-\tsock_put(newsk);\n--\nnet/sctp/socket.c-4917-\t */\nnet/sctp/socket.c:4918:\tsecurity_sctp_sk_clone(asoc, sk, newsk);\nnet/sctp/socket.c-4919-\n--\nnet/tipc/socket.c=2721=static int tipc_accept(struct socket *sock, struct socket *new_sock,\n--\nnet/tipc/socket.c-2747-\t\tgoto exit;\nnet/tipc/socket.c:2748:\tsecurity_sk_clone(sock-\u003esk, new_sock-\u003esk);\nnet/tipc/socket.c-2749-\n--\nnet/tls/tls_main.c=1071=static void tls_update(struct sock *sk, struct proto *p,\n--\nnet/tls/tls_main.c-1082-\t} else {\nnet/tls/tls_main.c:1083:\t\t/* Pairs with lockless read in sk_clone_lock(). */\nnet/tls/tls_main.c-1084-\t\tWRITE_ONCE(sk-\u003esk_prot, p);\n--\nnet/vmw_vsock/af_vsock.c=904=static struct sock *__vsock_create(struct net *net,\n--\nnet/vmw_vsock/af_vsock.c-954-\t\tvsk-\u003ebuffer_max_size = psk-\u003ebuffer_max_size;\nnet/vmw_vsock/af_vsock.c:955:\t\tsecurity_sk_clone(parent, sk);\nnet/vmw_vsock/af_vsock.c-956-\t} else {\n--\nnet/xfrm/xfrm_policy.c=2409=static struct xfrm_policy *clone_policy(const struct xfrm_policy *old, int dir)\n--\nnet/xfrm/xfrm_policy.c-2440-\nnet/xfrm/xfrm_policy.c:2441:int __xfrm_sk_clone_policy(struct sock *sk, const struct sock *osk)\nnet/xfrm/xfrm_policy.c-2442-{\n--\nsecurity/apparmor/lsm.c=1087=static void apparmor_sk_free_security(struct sock *sk)\n--\nsecurity/apparmor/lsm.c-1097-/**\nsecurity/apparmor/lsm.c:1098: * apparmor_sk_clone_security - clone the sk_security field\nsecurity/apparmor/lsm.c-1099- * @sk: sock to have security cloned\n--\nsecurity/apparmor/lsm.c-1101- */\nsecurity/apparmor/lsm.c:1102:static void apparmor_sk_clone_security(const struct sock *sk,\nsecurity/apparmor/lsm.c-1103-\t\t\t\t       struct sock *newsk)\n--\nsecurity/apparmor/lsm.c=1767=static struct security_hook_list apparmor_hooks[] __ro_after_init = {\n--\nsecurity/apparmor/lsm.c-1806-\tLSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),\nsecurity/apparmor/lsm.c:1807:\tLSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),\nsecurity/apparmor/lsm.c-1808-\n--\nsecurity/security.c=4509=void security_sk_free(struct sock *sk)\n--\nsecurity/security.c-4516-/**\nsecurity/security.c:4517: * security_sk_clone() - Clone a sock's LSM state\nsecurity/security.c-4518- * @sk: original sock\n--\nsecurity/security.c-4522- */\nsecurity/security.c:4523:void security_sk_clone(const struct sock *sk, struct sock *newsk)\nsecurity/security.c-4524-{\nsecurity/security.c:4525:\tcall_void_hook(sk_clone_security, sk, newsk);\nsecurity/security.c-4526-}\nsecurity/security.c:4527:EXPORT_SYMBOL(security_sk_clone);\nsecurity/security.c-4528-\n--\nsecurity/security.c=4585=EXPORT_SYMBOL(security_inet_conn_request);\n--\nsecurity/security.c-4587-/**\nsecurity/security.c:4588: * security_inet_csk_clone() - Set new sock LSM state based on request_sock\nsecurity/security.c-4589- * @newsk: new sock\n--\nsecurity/security.c-4593- */\nsecurity/security.c:4594:void security_inet_csk_clone(struct sock *newsk,\nsecurity/security.c-4595-\t\t\t     const struct request_sock *req)\nsecurity/security.c-4596-{\nsecurity/security.c:4597:\tcall_void_hook(inet_csk_clone, newsk, req);\nsecurity/security.c-4598-}\n--\nsecurity/security.c=4781=EXPORT_SYMBOL(security_sctp_bind_connect);\n--\nsecurity/security.c-4783-/**\nsecurity/security.c:4784: * security_sctp_sk_clone() - Clone a SCTP sock's LSM state\nsecurity/security.c-4785- * @asoc: SCTP association\n--\nsecurity/security.c-4792- */\nsecurity/security.c:4793:void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,\nsecurity/security.c-4794-\t\t\t    struct sock *newsk)\nsecurity/security.c-4795-{\nsecurity/security.c:4796:\tcall_void_hook(sctp_sk_clone, asoc, sk, newsk);\nsecurity/security.c-4797-}\nsecurity/security.c:4798:EXPORT_SYMBOL(security_sctp_sk_clone);\nsecurity/security.c-4799-\n--\nsecurity/selinux/hooks.c=5574=static void selinux_sk_free_security(struct sock *sk)\n--\nsecurity/selinux/hooks.c-5580-\nsecurity/selinux/hooks.c:5581:static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)\nsecurity/selinux/hooks.c-5582-{\n--\nsecurity/selinux/hooks.c=5677=static int selinux_sctp_assoc_request(struct sctp_association *asoc,\n--\nsecurity/selinux/hooks.c-5693-\t * sockets and peeled off connections as they cause a new\nsecurity/selinux/hooks.c:5694:\t * socket to be generated. selinux_sctp_sk_clone() will then\nsecurity/selinux/hooks.c-5695-\t * plug this into the new socket.\n--\nsecurity/selinux/hooks.c=5710=static int selinux_sctp_assoc_established(struct sctp_association *asoc,\n--\nsecurity/selinux/hooks.c-5718-\t/* Inherit secid from the parent socket - this will be picked up\nsecurity/selinux/hooks.c:5719:\t * by selinux_sctp_sk_clone() if the association gets peeled off\nsecurity/selinux/hooks.c-5720-\t * into a new socket.\n--\nsecurity/selinux/hooks.c=5730=static int selinux_sctp_bind_connect(struct sock *sk, int optname,\n--\nsecurity/selinux/hooks.c-5806-/* Called whenever a new socket is created by accept(2) or sctp_peeloff(3). */\nsecurity/selinux/hooks.c:5807:static void selinux_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,\nsecurity/selinux/hooks.c-5808-\t\t\t\t  struct sock *newsk)\n--\nsecurity/selinux/hooks.c-5816-\tif (!selinux_policycap_extsockclass())\nsecurity/selinux/hooks.c:5817:\t\treturn selinux_sk_clone_security(sk, newsk);\nsecurity/selinux/hooks.c-5818-\n--\nsecurity/selinux/hooks.c-5821-\tnewsksec-\u003esclass = sksec-\u003esclass;\nsecurity/selinux/hooks.c:5822:\tselinux_netlbl_sctp_sk_clone(sk, newsk);\nsecurity/selinux/hooks.c-5823-}\n--\nsecurity/selinux/hooks.c=5840=static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb,\n--\nsecurity/selinux/hooks.c-5860-\nsecurity/selinux/hooks.c:5861:static void selinux_inet_csk_clone(struct sock *newsk,\nsecurity/selinux/hooks.c-5862-\t\t\t\t   const struct request_sock *req)\n--\nsecurity/selinux/hooks.c-5874-\t * thread with access to newsksec */\nsecurity/selinux/hooks.c:5875:\tselinux_netlbl_inet_csk_clone(newsk, req-\u003ersk_ops-\u003efamily);\nsecurity/selinux/hooks.c-5876-}\n--\nsecurity/selinux/hooks.c=7560=static struct security_hook_list selinux_hooks[] __ro_after_init = {\n--\nsecurity/selinux/hooks.c-7730-\tLSM_HOOK_INIT(sk_free_security, selinux_sk_free_security),\nsecurity/selinux/hooks.c:7731:\tLSM_HOOK_INIT(sk_clone_security, selinux_sk_clone_security),\nsecurity/selinux/hooks.c-7732-\tLSM_HOOK_INIT(sk_getsecid, selinux_sk_getsecid),\n--\nsecurity/selinux/hooks.c-7734-\tLSM_HOOK_INIT(sctp_assoc_request, selinux_sctp_assoc_request),\nsecurity/selinux/hooks.c:7735:\tLSM_HOOK_INIT(sctp_sk_clone, selinux_sctp_sk_clone),\nsecurity/selinux/hooks.c-7736-\tLSM_HOOK_INIT(sctp_bind_connect, selinux_sctp_bind_connect),\n--\nsecurity/selinux/hooks.c-7739-\tLSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request),\nsecurity/selinux/hooks.c:7740:\tLSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone),\nsecurity/selinux/hooks.c-7741-\tLSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established),\n--\nsecurity/selinux/include/netlabel.h=40=int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family);\nsecurity/selinux/include/netlabel.h:41:void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family);\nsecurity/selinux/include/netlabel.h:42:void selinux_netlbl_sctp_sk_clone(struct sock *sk, struct sock *newsk);\nsecurity/selinux/include/netlabel.h-43-int selinux_netlbl_socket_post_create(struct sock *sk, u16 family);\n--\nsecurity/selinux/include/netlabel.h=96=static inline int selinux_netlbl_inet_conn_request(struct request_sock *req,\n--\n\n"
}

gemini-3.7-flash

null

null

							input: 24933
							output: 21
							thoughts: 206
						

**Analyzing a Socket Cloning Vulnerability**

Okay, let's break this down. It seems there's a potential use-after-free or double-free vulnerability within the socket cloning mechanism (`sk_clone`). My initial thought is to understand the context – this sounds like a core networking issue.

Essentially, `sock_copy` in `sk_clone` does a shallow copy of the `sock` structure. The crux of the problem lies in the `sk->psp_assoc` pointer. If the original socket (`sk`) has this `psp_assoc` pointer set, the cloned socket (`newsk`) gets a *direct* copy of that pointer: `newsk->psp_assoc = sk->psp_assoc`. No reference counting, no safeguards, just a straight pointer assignment.

This is where things get dicey. If the parent socket (`sk`) and the child socket (`newsk`) now both believe they own `psp_assoc`, we have a collision. Destroying either socket or explicitly calling `psp_sk_assoc_free(newsk)` on the clone would cause `psp_assoc` to be freed, potentially leaving a dangling pointer for the other socket or any other subsequent use. And this could lead to the classic "use-after-free" or "double free" scenarios.

The proposed patch is smart. They're initializing `newsk->psp_assoc` to `NULL` immediately after the copy using `RCU_INIT_POINTER(newsk->psp_assoc, NULL);`. This effectively prevents the dangling pointer issue by ensuring the clone doesn't point to the original structure. Now, I need to understand how the sockets use `psp_assoc` and where `psp_sk_assoc_free` is called to fully grasp the impact and the need for this patch. I need to trace the code path for both socket destruction and explicit `psp_sk_assoc_free` calls to solidify this understanding.

{
  "Expression": "psp_sk_assoc_free"
}

{
  "Output": "include/net/psp/functions.h=33=unsigned int psp_key_size(u32 version);\ninclude/net/psp/functions.h:34:void psp_sk_assoc_free(struct sock *sk);\ninclude/net/psp/functions.h-35-void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk);\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-157-#else\ninclude/net/psp/functions.h:158:static inline void psp_sk_assoc_free(struct sock *sk) { }\ninclude/net/psp/functions.h-159-static inline void\n--\nnet/ipv4/af_inet.c=140=void inet_sock_destruct(struct sock *sk)\n--\nnet/ipv4/af_inet.c-166-\tdst_release(rcu_dereference_protected(sk-\u003esk_rx_dst, 1));\nnet/ipv4/af_inet.c:167:\tpsp_sk_assoc_free(sk);\nnet/ipv4/af_inet.c-168-}\n--\nnet/psp/psp_sock.c=118=void psp_assoc_put(struct psp_assoc *pas)\n--\nnet/psp/psp_sock.c-123-\nnet/psp/psp_sock.c:124:void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\n"
}

gemini-3.7-flash

null

null

							input: 25993
							output: 19
							thoughts: 555
						

**Analyzing a Potential Kernel Vulnerability Fix**

Okay, so I've been looking at this patch and, as an expert in my field, I need to determine its significance for fuzzing and potential vulnerabilities. The core issue seems to be a refcounting problem related to how `psp_sk_assoc` is handled during socket cloning. Specifically, `inet_sock_destruct` calls `psp_sk_assoc_free`, which in turn involves `psp_assoc_put`. The problem arises when a listening TCP socket, or a cloned socket derived from it, is cloned via `sk_clone_lock` and `sk_clone`. `sock_copy` duplicates the socket structure (`sk`) to `newsk`. If the `sk->psp_assoc` pointer was set, `newsk->psp_assoc` would initially point to the same memory location (`pas`) without a refcount increase. The original code could then lead to a double decrement of the reference count when both sockets are eventually destroyed, causing a use-after-free or double-free condition.

The fix, by setting `RCU_INIT_POINTER(newsk->psp_assoc, NULL);`, initializes the `newsk->psp_assoc` to `NULL`, preventing the duplicate reference.

Now, let's assess the fuzzing potential.

1.  **Is this a modification to reachable kernel logic?** Absolutely, `sk_clone()` in `net/core/sock.c` is the socket cloning function and it's used across a variety of networking protocols (TCP, SCTP, MPTCP) whenever a new connection is accepted from a listening socket. This fix modifies that core cloning logic when `INET_PSP` is enabled.
2.  **Can this be fuzzed in common environments?** Yes, this is a pure software-based operation, involving network protocols. It can be exercised in standard Linux environments, QEMU, or even with netdevsim/veth/loopback setups.
3.  **Is it worth the fuzzing effort?** Definitely. This fixes a refcounting and memory management issue related to PSP within the critical process of socket cloning. PSP is a networking feature enabled by `CONFIG_INET_PSP`. It's testable with fuzzing using the socket operations, like TCP accept, listen, connect, and potentially netlink commands related to PSP.

Now, I need to check the Kconfig requirements, specifically the dependencies. Let's look at `net/psp/Kconfig` and if it has any further dependencies. We've confirmed that `INET_PSP` depends on `INET`, but are there any hidden dependencies in `net/psp/Kconfig` itself, or perhaps `net/Kconfig` or `drivers/net/netdevsim/Kconfig`? It's always important to fully understand the build environment.

{
  "Expression": "source.*net/psp"
}

{
  "Output": "net/Kconfig=84=source \"net/packet/Kconfig\"\nnet/Kconfig:85:source \"net/psp/Kconfig\"\nnet/Kconfig-86-source \"net/unix/Kconfig\"\n"
}

gemini-3.7-flash

null

null

							input: 27238
							output: 21
							thoughts: 180
						

**My Initial Assessment of PSP Security Protocol Support**

Okay, so I've been given this Kconfig entry for the PSP Security Protocol. First, I need to understand it fully. Let's delve into the `net/psp/Kconfig` file directly to get the complete picture. I'm noting the boolean nature of the configuration option, the dependency on `INET`, and the select statements choosing `SKB_DECRYPTED`, `SKB_EXTENSIONS`, and `SOCK_VALIDATE_XMIT`. These dependencies give me immediate clues about the underlying kernel architecture and how this protocol integrates. The documentation link points to the architectural specification, which I'll absolutely review, likely multiple times. The "If unsure, say N" help text is standard, but I will be sure to avoid that.

Now, I want a more comprehensive understanding. I'm going to scan across all Kconfig files and header files in the relevant areas to check every place `INET_PSP` is referenced. Cross-referencing these is important. Next, I need to know the runtime configuration. How is PSP actually *associated* with a socket? I need to understand the mechanism for doing this. That will probably require more digging into the kernel source, but ideally, I want to see how this is configured and manipulated from user space. I'll need to look for any potential netlink interfaces or `setsockopt` options related to "PSP". This is where the real meat of understanding how it's used will come from.

{
  "Expression": "psp_sock_assoc_set"
}

{
  "Output": "net/psp/psp.h=25=void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas);\nnet/psp/psp.h:26:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp.h-27-\t\t\t  struct psp_key_parsed *key,\nnet/psp/psp.h-28-\t\t\t  struct netlink_ext_ack *extack);\nnet/psp/psp.h:29:int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\nnet/psp/psp.h-30-\t\t\t  u32 version, struct psp_key_parsed *key,\n--\nnet/psp/psp_nl.c=770=int psp_nl_rx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-809-\nnet/psp/psp_nl.c:810:\terr = psp_sock_assoc_set_rx(socket-\u003esk, pas, \u0026key, info-\u003eextack);\nnet/psp/psp_nl.c-811-\tif (err) {\n--\nnet/psp/psp_nl.c=826=int psp_nl_tx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-857-\nnet/psp/psp_nl.c:858:\terr = psp_sock_assoc_set_tx(socket-\u003esk, psd, version, \u0026key,\nnet/psp/psp_nl.c-859-\t\t\t\t    info-\u003eextack);\n--\nnet/psp/psp_sock.c=124=void psp_sk_assoc_free(struct sock *sk)\n--\nnet/psp/psp_sock.c-131-\nnet/psp/psp_sock.c:132:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp_sock.c-133-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp_sock.c=158=static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n--\nnet/psp/psp_sock.c-176-\nnet/psp/psp_sock.c:177:int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\nnet/psp/psp_sock.c-178-\t\t\t  u32 version, struct psp_key_parsed *key,\n"
}

gemini-3.7-flash

null

null

							input: 28463
							output: 37
							thoughts: 39
						

Okay, let's dive into this. Here's how I'd approach that snippet of code, thinking through it as an expert would:

**Diving into `psp_sock_assoc_set_rx` and `psp_sock_assoc_set_tx`**

Right, I need to get a handle on what's happening with socket association, specifically in the `net/psp/psp_sock.c` file. My attention is drawn to `psp_sock_assoc_set_rx` and `psp_sock_assoc_set_tx`. These functions likely control the setup of receive and transmit associations for these particular PSP sockets. I'm assuming "PSP" is something proprietary or specific to this network stack; knowing this, I can infer that the associations being set here are likely tied to some internal data structure or mechanism for efficiently handling these sockets.

I need to understand what "association" means in this context. Is it about linking a socket to a specific hardware resource, flow ID, queue, or even a particular buffer? Is this about setting up a context for packet processing or data transfer direction? The "set\_rx" and "set\_tx" distinction strongly suggests the directionality of the connection is relevant.

My first step will be to quickly review the surrounding code in `psp_sock.c` to understand the general architecture of the PSP socket implementation. I'll be looking for clues on how associations are used, what data structures they relate to (especially anything with "assoc," "rx," or "tx" in the name), and how these functions interact with the larger network stack. I'll need to trace the data flow through these functions, identifying any dependencies or potential error conditions. Context is key, and I'll need to quickly establish the *why* of these functions and the *how* they're designed. Then I can dig into the specifics of *what* is happening.

{
  "File": "net/psp/psp_sock.c",
  "FirstLine": 120,
  "LineCount": 90
}

{
  "Contents": " 120:\t\tif (pas \u0026\u0026 refcount_dec_and_test(\u0026pas-\u003erefcnt))\n 121:\t\t\tcall_rcu(\u0026pas-\u003ercu, psp_assoc_free_queue);\n 122:\t}\n 123:\t\n 124:\tvoid psp_sk_assoc_free(struct sock *sk)\n 125:\t{\n 126:\t\tstruct psp_assoc *pas = rcu_dereference_protected(sk-\u003epsp_assoc, 1);\n 127:\t\n 128:\t\trcu_assign_pointer(sk-\u003epsp_assoc, NULL);\n 129:\t\tpsp_assoc_put(pas);\n 130:\t}\n 131:\t\n 132:\tint psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n 133:\t\t\t\t  struct psp_key_parsed *key,\n 134:\t\t\t\t  struct netlink_ext_ack *extack)\n 135:\t{\n 136:\t\tint err;\n 137:\t\n 138:\t\tmemcpy(\u0026pas-\u003erx, key, sizeof(*key));\n 139:\t\n 140:\t\tlock_sock(sk);\n 141:\t\n 142:\t\tif (psp_sk_assoc(sk)) {\n 143:\t\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n 144:\t\t\terr = -EBUSY;\n 145:\t\t\tgoto exit_unlock;\n 146:\t\t}\n 147:\t\n 148:\t\trefcount_inc(\u0026pas-\u003erefcnt);\n 149:\t\trcu_assign_pointer(sk-\u003epsp_assoc, pas);\n 150:\t\terr = 0;\n 151:\t\n 152:\texit_unlock:\n 153:\t\trelease_sock(sk);\n 154:\t\n 155:\t\treturn err;\n 156:\t}\n 157:\t\n 158:\tstatic int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\n 159:\t{\n 160:\t\tstruct psp_skb_ext *pse;\n 161:\t\tstruct sk_buff *skb;\n 162:\t\n 163:\t\tskb_rbtree_walk(skb, \u0026tcp_sk(sk)-\u003eout_of_order_queue) {\n 164:\t\t\tpse = skb_ext_find(skb, SKB_EXT_PSP);\n 165:\t\t\tif (!psp_pse_matches_pas(pse, pas))\n 166:\t\t\t\treturn -EBUSY;\n 167:\t\t}\n 168:\t\n 169:\t\tskb_queue_walk(\u0026sk-\u003esk_receive_queue, skb) {\n 170:\t\t\tpse = skb_ext_find(skb, SKB_EXT_PSP);\n 171:\t\t\tif (!psp_pse_matches_pas(pse, pas))\n 172:\t\t\t\treturn -EBUSY;\n 173:\t\t}\n 174:\t\treturn 0;\n 175:\t}\n 176:\t\n 177:\tint psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n 178:\t\t\t\t  u32 version, struct psp_key_parsed *key,\n 179:\t\t\t\t  struct netlink_ext_ack *extack)\n 180:\t{\n 181:\t\tstruct inet_connection_sock *icsk;\n 182:\t\tstruct psp_assoc *pas, *dummy;\n 183:\t\tint err;\n 184:\t\n 185:\t\tlock_sock(sk);\n 186:\t\n 187:\t\tpas = psp_sk_assoc(sk);\n 188:\t\tif (!pas) {\n 189:\t\t\tNL_SET_ERR_MSG(extack, \"Socket has no Rx key\");\n 190:\t\t\terr = -EINVAL;\n 191:\t\t\tgoto exit_unlock;\n 192:\t\t}\n 193:\t\tif (pas-\u003epsd != psd) {\n 194:\t\t\tNL_SET_ERR_MSG(extack, \"Rx key from different device\");\n 195:\t\t\terr = -EINVAL;\n 196:\t\t\tgoto exit_unlock;\n 197:\t\t}\n 198:\t\tif (pas-\u003eversion != version) {\n 199:\t\t\tNL_SET_ERR_MSG(extack,\n 200:\t\t\t\t       \"PSP version mismatch with existing state\");\n 201:\t\t\terr = -EINVAL;\n 202:\t\t\tgoto exit_unlock;\n 203:\t\t}\n 204:\t\tif (pas-\u003etx.spi) {\n 205:\t\t\tNL_SET_ERR_MSG(extack, \"Tx key already set\");\n 206:\t\t\terr = -EBUSY;\n 207:\t\t\tgoto exit_unlock;\n 208:\t\t}\n 209:\t\n"
}

gemini-3.7-flash

null

null

							input: 30273
							output: 146
							thoughts: 601
						

**My Analysis of the Kernel Patch for Fuzzing**

Okay, let's break this down for fuzzing purposes. The core of this patch seems to revolve around `sk_clone()` in `net/core/sock.c`. My initial thought is to identify all relevant symbols that are modified or directly related to this patch and determine the most effective parameters for fuzzing.

My analysis went like this:
1.  **Modified Function:** First, I confirmed that `sk_clone` is indeed the primary function being modified.
2.  **Hot Path Analysis:** I considered whether `sk_clone` is a frequently executed hot-path function or less critical and confirmed it's called during TCP/SCTP connection setup which is an important but not always hot path. This informs my fuzzing strategy.
3.  **Instruction Alignment:** I then carefully re-read the relevant fuzzing instruction which emphasizes focusing on specific, non-generic entrypoints. The instruction also highlighted the preference for non-static, non-inlined API entrypoints to ensure distinct symbol addresses for fuzzing.
4.  **Identifying Focus Symbols:** Based on the patch, I've identified the *`sk_clone`* function and *netlink entrypoints for PSP*: `psp_nl_rx_assoc_doit`, `psp_nl_tx_assoc_doit`, and the socket association functions: `psp_sock_assoc_set_rx`, `psp_sock_assoc_set_tx`, `psp_sk_assoc_free` as the main focus symbols.
5.  **Configuration Dependencies:** I checked for configuration requirements and dependencies like `CONFIG_INET_PSP`. I confirmed that `INET_PSP` depends on `INET`, which in turn depends on `NET`
6.  **Verifying Fuzzing Suitability:** I verified the patch fixes a refcounting/socket initialization issue when cloning sockets with PSP support enabled (`CONFIG_INET_PSP`), confirming its suitability for fuzzing.
7.  **`FocusSymbols` Refinement:** With that in mind, I reviewed the key fuzzing parameters:
    *   **`WorthFuzzing`:** Confirmed that the fix is worth fuzzing due to the refcounting/socket initialization issue.
    *   **`FocusSymbols`:** My final selection for FocusSymbols includes:
        *   `sk_clone`
        *   `psp_sock_assoc_set_rx`
        *   `psp_sock_assoc_set_tx`
        *   `psp_sk_assoc_free`
    *   **`EnableConfigs`:** The configurations to enable are:
        *   `INET_PSP`
        *   `INET`
8.  **Final Verification:** I double-checked the non-static nature of these functions, finding that `sk_clone` is `EXPORT_SYMBOL_GPL` and the others are also non-static functions.

Based on this, I'm confident in setting up the fuzzing targets and configurations. My understanding of the patch and the system requirements is now solid.

{
  "EnableConfigs": [
    "INET_PSP",
    "INET"
  ],
  "FocusSymbols": [
    "sk_clone",
    "psp_sock_assoc_set_rx",
    "psp_sock_assoc_set_tx",
    "psp_sk_assoc_free"
  ],
  "Reasoning": "The patch ensures that the socket's psp_assoc pointer is cleared during sk_clone() when INET_PSP is enabled, preventing the newly cloned socket from inheriting the parent socket's PSP association pointer without incrementing its reference count. This avoids potential use-after-free and double-free conditions upon socket destruction.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "INET_PSP",
    "INET"
  ],
  "FocusSymbols": [
    "sk_clone",
    "psp_sock_assoc_set_rx",
    "psp_sock_assoc_set_tx",
    "psp_sk_assoc_free"
  ],
  "Reasoning": "The patch ensures that the socket's psp_assoc pointer is cleared during sk_clone() when INET_PSP is enabled, preventing the newly cloned socket from inheriting the parent socket's PSP association pointer without incrementing its reference count. This avoids potential use-after-free and double-free conditions upon socket destruction.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

null

core

null

{
  "KMSANReasoning": "The patch modifies `sk_clone()` in `net/core/sock.c` to explicitly initialize `newsk-\u003epsp_assoc` to `NULL` via `RCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL)`. \n\nWhen a socket is cloned, `sock_copy()` performs a shallow copy of the socket structure from parent to child. Without clearing `newsk-\u003epsp_assoc`, the cloned socket inherited the parent's pointer to `struct psp_assoc` without taking an additional reference count. Upon destruction of the cloned socket (`psp_sk_assoc_free`), `psp_assoc_put()` would be called, leading to reference underflow, use-after-free, or double-free errors.\n\nThis change is purely addressing object lifecycle, pointer aliasing, and reference counting issues (which are detected by KASAN). No uninitialized memory is allocated, read, or leaked to userspace. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}

You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.

CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
  a comprehensive suite of debugging tools and sanitizers, including KASAN
  (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
  (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
  or page allocations) and kernel-to-user memory info-leaks.

Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.

Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.

Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
   attributes, ioctl output arguments, socket options, or BPF buffers) where fields
   or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
   or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
   could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
   uninitialized bytes of existing buffers.

Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
  dereferences, locking deadlocks, or use-after-free bugs (these are already caught
  by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
  or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.

Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit 3a5a85ebbac69752e0afaf6ca888b53aa56f049f
Author: syz-cluster <triage@syzkaller.com>
Date:   Sat Aug 29 17:23:14 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/core/sock.c b/net/core/sock.c
index 1ad41904db25b..fa60b7494c586 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2494,6 +2494,9 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority,
 #ifdef CONFIG_BPF_SYSCALL
 	RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
 #endif
+#if IS_ENABLED(CONFIG_INET_PSP)
+	RCU_INIT_POINTER(newsk->psp_assoc, NULL);
+#endif
 
 	/* SANITY */
 	if (likely(newsk->sk_net_refcnt)) {

gemini-3.7-flash

null

null

							input: 2079
							output: 17
							thoughts: 112
						

**Analyzing a Recent Network Patch**

Okay, let's dive into this. The patch is touching `net/core/sock.c`, specifically the `sk_clone` (or potentially `sk_clone_lock`) function. That's a key spot for socket cloning, and any modification there warrants a close look. The snippet itself is pretty straightforward: it's adding a conditional block based on `CONFIG_INET_PSP`. Inside that conditional, it's initializing `newsk->psp_assoc` to `NULL` using `RCU_INIT_POINTER`. Seems like they're associating some sort of pointer with the new socket clone if this `CONFIG_INET_PSP` feature is enabled.

Right, so, first things first, I need to figure out what `psp_assoc` *is* and what this `CONFIG_INET_PSP` flag controls. Time to go hunting through the codebase. I'll need to figure out the use case here to see if any security or stability concerns come to mind as a result of that association and the cloning process. Also, given it’s RCU init, there are implications in terms of potential race conditions and memory safety with respect to that read and write. Let's see what’s going on.

{
  "Expression": "psp_assoc"
}

{
  "Output": "drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c=931=struct psp_key {\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-934-\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:935:static int mlx5e_psp_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-936-\t\t\t       struct netlink_ext_ack *extack)\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-960-\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:961:static void mlx5e_psp_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-962-{\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c=1011=static struct psp_dev_ops mlx5_psp_ops = {\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1013-\t.rx_spi_alloc = mlx5e_psp_rx_spi_alloc,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:1014:\t.tx_key_add   = mlx5e_psp_assoc_add,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c:1015:\t.tx_key_del   = mlx5e_psp_assoc_del,\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c-1016-\t.key_rotate   = mlx5e_psp_key_rotate,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c=93=static bool mlx5e_psp_set_state(struct mlx5e_priv *priv,\n--\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c-96-{\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c:97:\tstruct psp_assoc *pas;\ndrivers/net/ethernet/mellanox/mlx5/core/en_accel/psp_rxtx.c-98-\tbool ret = false;\n--\ndrivers/net/netdevsim/psp.c=18=nsim_do_psp(struct sk_buff *skb, struct netdevsim *ns,\n--\ndrivers/net/netdevsim/psp.c-22-\tstruct psp_dev *peer_psd;\ndrivers/net/netdevsim/psp.c:23:\tstruct psp_assoc *pas;\ndrivers/net/netdevsim/psp.c-24-\tstruct net *net;\n--\ndrivers/net/netdevsim/psp.c-39-\ndrivers/net/netdevsim/psp.c:40:\tptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-41-\tif (*ptr != ns) {\n--\ndrivers/net/netdevsim/psp.c=131=nsim_rx_spi_alloc(struct psp_dev *psd, u32 version,\n--\ndrivers/net/netdevsim/psp.c-151-\ndrivers/net/netdevsim/psp.c:152:static int nsim_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,\ndrivers/net/netdevsim/psp.c-153-\t\t\t  struct netlink_ext_ack *extack)\n--\ndrivers/net/netdevsim/psp.c-155-\tstruct netdevsim *ns = psd-\u003edrv_priv;\ndrivers/net/netdevsim/psp.c:156:\tvoid **ptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-157-\n--\ndrivers/net/netdevsim/psp.c=165=static int nsim_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *extack)\n--\ndrivers/net/netdevsim/psp.c-179-\ndrivers/net/netdevsim/psp.c:180:static void nsim_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)\ndrivers/net/netdevsim/psp.c-181-{\ndrivers/net/netdevsim/psp.c-182-\tstruct netdevsim *ns = psd-\u003edrv_priv;\ndrivers/net/netdevsim/psp.c:183:\tvoid **ptr = psp_assoc_drv_data(pas);\ndrivers/net/netdevsim/psp.c-184-\n--\ninclude/net/inet_timewait_sock.h=33=struct inet_timewait_sock {\n--\ninclude/net/inet_timewait_sock.h-85-#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/inet_timewait_sock.h:86:\tstruct psp_assoc __rcu\t  *psp_assoc;\ninclude/net/inet_timewait_sock.h-87-#endif\n--\ninclude/net/psp/functions.h=22=int psp_dev_rcv(struct sk_buff *skb, u16 dev_id, u8 generation, bool strip_icv);\n--\ninclude/net/psp/functions.h-24-/* Kernel-facing API */\ninclude/net/psp/functions.h:25:void psp_assoc_put(struct psp_assoc *pas);\ninclude/net/psp/functions.h-26-\ninclude/net/psp/functions.h:27:static inline void *psp_assoc_drv_data(struct psp_assoc *pas)\ninclude/net/psp/functions.h-28-{\n--\ninclude/net/psp/functions.h=37=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb);\ninclude/net/psp/functions.h-38-\ninclude/net/psp/functions.h:39:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-40-{\ninclude/net/psp/functions.h:41:\treturn rcu_dereference_check(sk-\u003epsp_assoc, lockdep_sock_is_held(sk));\ninclude/net/psp/functions.h-42-}\n--\ninclude/net/psp/functions.h=45=psp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb)\ninclude/net/psp/functions.h-46-{\ninclude/net/psp/functions.h:47:\tstruct psp_assoc *pas;\ninclude/net/psp/functions.h-48-\n--\ninclude/net/psp/functions.h=69=static inline bool\ninclude/net/psp/functions.h:70:psp_is_allowed_nondata(struct sk_buff *skb, struct psp_assoc *pas)\ninclude/net/psp/functions.h-71-{\n--\ninclude/net/psp/functions.h=82=static inline bool\ninclude/net/psp/functions.h:83:psp_pse_matches_pas(struct psp_skb_ext *pse, struct psp_assoc *pas)\ninclude/net/psp/functions.h-84-{\n--\ninclude/net/psp/functions.h=91=static inline enum skb_drop_reason\ninclude/net/psp/functions.h:92:__psp_sk_rx_policy_check(struct sk_buff *skb, struct psp_assoc *pas)\ninclude/net/psp/functions.h-93-{\n--\ninclude/net/psp/functions.h=122=psp_twsk_rx_policy_check(struct inet_timewait_sock *tw, struct sk_buff *skb)\ninclude/net/psp/functions.h-123-{\ninclude/net/psp/functions.h:124:\treturn __psp_sk_rx_policy_check(skb, rcu_dereference(tw-\u003epsp_assoc));\ninclude/net/psp/functions.h-125-}\ninclude/net/psp/functions.h-126-\ninclude/net/psp/functions.h:127:static inline struct psp_assoc *psp_sk_get_assoc_rcu(const struct sock *sk)\ninclude/net/psp/functions.h-128-{\ninclude/net/psp/functions.h:129:\tstruct psp_assoc *pas;\ninclude/net/psp/functions.h-130-\tint state;\n--\ninclude/net/psp/functions.h-136-\tpas = state == TCP_TIME_WAIT ?\ninclude/net/psp/functions.h:137:\t\t      rcu_dereference(inet_twsk(sk)-\u003epsp_assoc) :\ninclude/net/psp/functions.h:138:\t\t      rcu_dereference(sk-\u003epsp_assoc);\ninclude/net/psp/functions.h-139-\treturn pas;\n--\ninclude/net/psp/functions.h-141-\ninclude/net/psp/functions.h:142:static inline struct psp_assoc *psp_skb_get_assoc_rcu(struct sk_buff *skb)\ninclude/net/psp/functions.h-143-{\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-152-\tint psp_encap = sizeof(struct udphdr) + PSP_HDR_SIZE + PSP_TRL_SIZE;\ninclude/net/psp/functions.h:153:\tbool has_psp = rcu_access_pointer(sk-\u003epsp_assoc);\ninclude/net/psp/functions.h-154-\n--\ninclude/net/psp/functions.h=163=psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\ninclude/net/psp/functions.h-164-\ninclude/net/psp/functions.h:165:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-166-{\n--\ninclude/net/psp/functions.h=187=psp_twsk_rx_policy_check(struct inet_timewait_sock *tw, struct sk_buff *skb)\n--\ninclude/net/psp/functions.h-191-\ninclude/net/psp/functions.h:192:static inline struct psp_assoc *psp_skb_get_assoc_rcu(struct sk_buff *skb)\ninclude/net/psp/functions.h-193-{\n--\ninclude/net/psp/types.h=43=struct psp_dev_config {\n--\ninclude/net/psp/types.h-53-/**\ninclude/net/psp/types.h:54: * struct psp_assoc_dev - wrapper for associated net_device\ninclude/net/psp/types.h-55- * @dev_list: list node for psp_dev::assoc_dev_list\n--\ninclude/net/psp/types.h-58- */\ninclude/net/psp/types.h:59:struct psp_assoc_dev {\ninclude/net/psp/types.h-60-\tstruct list_head dev_list;\n--\ninclude/net/psp/types.h-67- * @main_netdev: original netdevice of this PSP device\ninclude/net/psp/types.h:68: * @assoc_dev_list: list of psp_assoc_dev entries associated with this PSP device\ninclude/net/psp/types.h-69- * @assoc_dev_cnt: number of entries in @assoc_dev_list\n--\ninclude/net/psp/types.h=124=struct psp_dev_caps {\n--\ninclude/net/psp/types.h-132-\t * @assoc_drv_spc: size of driver-specific state in Tx assoc\ninclude/net/psp/types.h:133:\t * Determines the size of struct psp_assoc::drv_data\ninclude/net/psp/types.h-134-\t */\n--\ninclude/net/psp/types.h=150=struct psp_key_parsed {\n--\ninclude/net/psp/types.h-154-\ninclude/net/psp/types.h:155:struct psp_assoc {\ninclude/net/psp/types.h-156-\tstruct psp_dev *psd;\n--\ninclude/net/psp/types.h=195=struct psp_dev_ops {\n--\ninclude/net/psp/types.h-222-\t */\ninclude/net/psp/types.h:223:\tint (*tx_key_add)(struct psp_dev *psd, struct psp_assoc *pas,\ninclude/net/psp/types.h-224-\t\t\t  struct netlink_ext_ack *extack);\n--\ninclude/net/psp/types.h-228-\t */\ninclude/net/psp/types.h:229:\tvoid (*tx_key_del)(struct psp_dev *psd, struct psp_assoc *pas);\ninclude/net/psp/types.h-230-\n--\ninclude/net/sock.h=242=struct sk_filter;\n--\ninclude/net/sock.h-258-  *\t@sk_policy: flow policy\ninclude/net/sock.h:259:  *\t@psp_assoc: PSP association, if socket is PSP-secured\ninclude/net/sock.h-260-  *\t@sk_receive_queue: incoming packets\n--\ninclude/net/sock.h=365=struct sock {\n--\ninclude/net/sock.h-467-#if IS_ENABLED(CONFIG_INET_PSP)\ninclude/net/sock.h:468:\tstruct psp_assoc __rcu\t*psp_assoc;\ninclude/net/sock.h-469-#endif\n--\nnet/core/sock.c=2479=struct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n--\nnet/core/sock.c-2497-#if IS_ENABLED(CONFIG_INET_PSP)\nnet/core/sock.c:2498:\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\nnet/core/sock.c-2499-#endif\n--\nnet/psp/psp-nl-gen.c=71=static const struct genl_split_ops psp_nl_ops[] = {\n--\nnet/psp/psp-nl-gen.c-105-\t\t.cmd\t\t= PSP_CMD_RX_ASSOC,\nnet/psp/psp-nl-gen.c:106:\t\t.pre_doit\t= psp_assoc_device_get_locked,\nnet/psp/psp-nl-gen.c-107-\t\t.doit\t\t= psp_nl_rx_assoc_doit,\n--\nnet/psp/psp-nl-gen.c-114-\t\t.cmd\t\t= PSP_CMD_TX_ASSOC,\nnet/psp/psp-nl-gen.c:115:\t\t.pre_doit\t= psp_assoc_device_get_locked,\nnet/psp/psp-nl-gen.c-116-\t\t.doit\t\t= psp_nl_tx_assoc_doit,\n--\nnet/psp/psp-nl-gen.h=20=int psp_device_get_locked_admin(const struct genl_split_ops *ops,\nnet/psp/psp-nl-gen.h-21-\t\t\t\tstruct sk_buff *skb, struct genl_info *info);\nnet/psp/psp-nl-gen.h:22:int psp_assoc_device_get_locked(const struct genl_split_ops *ops,\nnet/psp/psp-nl-gen.h-23-\t\t\t\tstruct sk_buff *skb, struct genl_info *info);\n--\nnet/psp/psp.h=21=void psp_nl_notify_dev(struct psp_dev *psd, u32 cmd);\nnet/psp/psp.h-22-\nnet/psp/psp.h:23:struct psp_assoc *psp_assoc_create(struct psp_dev *psd);\nnet/psp/psp.h-24-struct psp_dev *psp_dev_get_for_sock(struct sock *sk);\nnet/psp/psp.h:25:void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas);\nnet/psp/psp.h:26:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp.h-27-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp.h=29=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp.h-31-\t\t\t  struct netlink_ext_ack *extack);\nnet/psp/psp.h:32:void psp_assocs_key_rotated(struct psp_dev *psd);\nnet/psp/psp.h-33-\n--\nnet/psp/psp_main.c=131=void psp_dev_unregister(struct psp_dev *psd)\nnet/psp/psp_main.c-132-{\nnet/psp/psp_main.c:133:\tstruct psp_assoc_dev *entry, *entry_tmp;\nnet/psp/psp_main.c:134:\tstruct psp_assoc *pas, *next;\nnet/psp/psp_main.c-135-\n--\nnet/psp/psp_main.c=408=static void psp_dev_disassoc_one(struct psp_dev *psd, struct net_device *dev)\nnet/psp/psp_main.c-409-{\nnet/psp/psp_main.c:410:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_main.c-411-\n--\nnet/psp/psp_nl.c=54=psp_nl_multicast_per_ns(struct psp_dev *psd, unsigned int group,\n--\nnet/psp/psp_nl.c-59-{\nnet/psp/psp_nl.c:60:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-61-\tstruct xarray sent_nets;\n--\nnet/psp/psp_nl.c=230=bool psp_has_assoc_dev_in_ns(struct psp_dev *psd, struct net *net)\nnet/psp/psp_nl.c-231-{\nnet/psp/psp_nl.c:232:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-233-\n--\nnet/psp/psp_nl.c=242=static int psp_nl_fill_assoc_dev_list(struct psp_dev *psd, struct sk_buff *rsp,\n--\nnet/psp/psp_nl.c-245-{\nnet/psp/psp_nl.c:246:\tstruct psp_assoc_dev *entry;\nnet/psp/psp_nl.c-247-\tstruct net *dev_net_ns;\n--\nnet/psp/psp_nl.c=447=int psp_nl_key_rotate_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-482-\nnet/psp/psp_nl.c:483:\tpsp_assocs_key_rotated(psd);\nnet/psp/psp_nl.c-484-\tpsd-\u003estats.rotations++;\n--\nnet/psp/psp_nl.c=499=int psp_nl_dev_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-501-\tstruct psp_dev *psd = info-\u003euser_ptr[0];\nnet/psp/psp_nl.c:502:\tstruct psp_assoc_dev *psp_assoc_dev;\nnet/psp/psp_nl.c-503-\tstruct net_device *assoc_dev;\n--\nnet/psp/psp_nl.c-518-\nnet/psp/psp_nl.c:519:\tpsp_assoc_dev = kzalloc_obj(*psp_assoc_dev);\nnet/psp/psp_nl.c:520:\tif (!psp_assoc_dev) {\nnet/psp/psp_nl.c-521-\t\terr = -ENOMEM;\n--\nnet/psp/psp_nl.c-526-\tassoc_dev = netdev_get_by_index(net, assoc_ifindex,\nnet/psp/psp_nl.c:527:\t\t\t\t\t\u0026psp_assoc_dev-\u003edev_tracker,\nnet/psp/psp_nl.c-528-\t\t\t\t\tGFP_KERNEL);\n--\nnet/psp/psp_nl.c-543-\nnet/psp/psp_nl.c:544:\tpsp_assoc_dev-\u003eassoc_dev = assoc_dev;\nnet/psp/psp_nl.c-545-\n--\nnet/psp/psp_nl.c-563-\nnet/psp/psp_nl.c:564:\tlist_add_tail(\u0026psp_assoc_dev-\u003edev_list, \u0026psd-\u003eassoc_dev_list);\nnet/psp/psp_nl.c-565-\tpsd-\u003eassoc_dev_cnt++;\n--\nnet/psp/psp_nl.c-575-err_put_dev:\nnet/psp/psp_nl.c:576:\tnetdev_put(assoc_dev, \u0026psp_assoc_dev-\u003edev_tracker);\nnet/psp/psp_nl.c-577-err_free_assoc:\nnet/psp/psp_nl.c:578:\tkfree(psp_assoc_dev);\nnet/psp/psp_nl.c-579-err_put_net:\n--\nnet/psp/psp_nl.c=585=int psp_nl_dev_disassoc_doit(struct sk_buff *skb, struct genl_info *info)\nnet/psp/psp_nl.c-586-{\nnet/psp/psp_nl.c:587:\tstruct psp_assoc_dev *entry, *found = NULL;\nnet/psp/psp_nl.c-588-\tstruct psp_dev *psd = info-\u003euser_ptr[0];\n--\nnet/psp/psp_nl.c-638-\nnet/psp/psp_nl.c:639:int psp_assoc_device_get_locked(const struct genl_split_ops *ops,\nnet/psp/psp_nl.c-640-\t\t\t\tstruct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c=770=int psp_nl_rx_assoc_doit(struct sk_buff *skb, struct genl_info *info)\n--\nnet/psp/psp_nl.c-774-\tstruct psp_key_parsed key;\nnet/psp/psp_nl.c:775:\tstruct psp_assoc *pas;\nnet/psp/psp_nl.c-776-\tstruct sk_buff *rsp;\n--\nnet/psp/psp_nl.c-792-\nnet/psp/psp_nl.c:793:\tpas = psp_assoc_create(psd);\nnet/psp/psp_nl.c-794-\tif (!pas) {\n--\nnet/psp/psp_nl.c-814-\t}\nnet/psp/psp_nl.c:815:\tpsp_assoc_put(pas);\nnet/psp/psp_nl.c-816-\n--\nnet/psp/psp_nl.c-819-err_free_pas:\nnet/psp/psp_nl.c:820:\tpsp_assoc_put(pas);\nnet/psp/psp_nl.c-821-err_free_rsp:\n--\nnet/psp/psp_sock.c=30=psp_validate_xmit(struct sock *sk, struct net_device *dev, struct sk_buff *skb)\nnet/psp/psp_sock.c-31-{\nnet/psp/psp_sock.c:32:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-33-\tbool good;\n--\nnet/psp/psp_sock.c-46-\nnet/psp/psp_sock.c:47:struct psp_assoc *psp_assoc_create(struct psp_dev *psd)\nnet/psp/psp_sock.c-48-{\nnet/psp/psp_sock.c:49:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-50-\n--\nnet/psp/psp_sock.c-68-\nnet/psp/psp_sock.c:69:static struct psp_assoc *psp_assoc_dummy(struct psp_assoc *pas)\nnet/psp/psp_sock.c-70-{\n--\nnet/psp/psp_sock.c-79-\nnet/psp/psp_sock.c:80:static int psp_dev_tx_key_add(struct psp_dev *psd, struct psp_assoc *pas,\nnet/psp/psp_sock.c-81-\t\t\t      struct netlink_ext_ack *extack)\n--\nnet/psp/psp_sock.c-85-\nnet/psp/psp_sock.c:86:void psp_dev_tx_key_del(struct psp_dev *psd, struct psp_assoc *pas)\nnet/psp/psp_sock.c-87-{\n--\nnet/psp/psp_sock.c-92-\nnet/psp/psp_sock.c:93:static void psp_assoc_free(struct work_struct *work)\nnet/psp/psp_sock.c-94-{\nnet/psp/psp_sock.c:95:\tstruct psp_assoc *pas = container_of(work, struct psp_assoc, work);\nnet/psp/psp_sock.c-96-\tstruct psp_dev *psd = pas-\u003epsd;\n--\nnet/psp/psp_sock.c-105-\nnet/psp/psp_sock.c:106:static void psp_assoc_free_queue(struct rcu_head *head)\nnet/psp/psp_sock.c-107-{\nnet/psp/psp_sock.c:108:\tstruct psp_assoc *pas = container_of(head, struct psp_assoc, rcu);\nnet/psp/psp_sock.c-109-\nnet/psp/psp_sock.c:110:\tINIT_WORK(\u0026pas-\u003ework, psp_assoc_free);\nnet/psp/psp_sock.c-111-\tschedule_work(\u0026pas-\u003ework);\n--\nnet/psp/psp_sock.c-114-/**\nnet/psp/psp_sock.c:115: * psp_assoc_put() - release a reference on a PSP association\nnet/psp/psp_sock.c-116- * @pas: association to release\nnet/psp/psp_sock.c-117- */\nnet/psp/psp_sock.c:118:void psp_assoc_put(struct psp_assoc *pas)\nnet/psp/psp_sock.c-119-{\nnet/psp/psp_sock.c-120-\tif (pas \u0026\u0026 refcount_dec_and_test(\u0026pas-\u003erefcnt))\nnet/psp/psp_sock.c:121:\t\tcall_rcu(\u0026pas-\u003ercu, psp_assoc_free_queue);\nnet/psp/psp_sock.c-122-}\n--\nnet/psp/psp_sock.c=124=void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\nnet/psp/psp_sock.c:126:\tstruct psp_assoc *pas = rcu_dereference_protected(sk-\u003epsp_assoc, 1);\nnet/psp/psp_sock.c-127-\nnet/psp/psp_sock.c:128:\trcu_assign_pointer(sk-\u003epsp_assoc, NULL);\nnet/psp/psp_sock.c:129:\tpsp_assoc_put(pas);\nnet/psp/psp_sock.c-130-}\nnet/psp/psp_sock.c-131-\nnet/psp/psp_sock.c:132:int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\nnet/psp/psp_sock.c-133-\t\t\t  struct psp_key_parsed *key,\n--\nnet/psp/psp_sock.c-148-\trefcount_inc(\u0026pas-\u003erefcnt);\nnet/psp/psp_sock.c:149:\trcu_assign_pointer(sk-\u003epsp_assoc, pas);\nnet/psp/psp_sock.c-150-\terr = 0;\n--\nnet/psp/psp_sock.c-157-\nnet/psp/psp_sock.c:158:static int psp_sock_recv_queue_check(struct sock *sk, struct psp_assoc *pas)\nnet/psp/psp_sock.c-159-{\n--\nnet/psp/psp_sock.c=177=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp_sock.c-181-\tstruct inet_connection_sock *icsk;\nnet/psp/psp_sock.c:182:\tstruct psp_assoc *pas, *dummy;\nnet/psp/psp_sock.c-183-\tint err;\n--\nnet/psp/psp_sock.c-219-\t */\nnet/psp/psp_sock.c:220:\tdummy = psp_assoc_dummy(pas);\nnet/psp/psp_sock.c-221-\tif (!dummy) {\n--\nnet/psp/psp_sock.c-248-\nnet/psp/psp_sock.c:249:void psp_assocs_key_rotated(struct psp_dev *psd)\nnet/psp/psp_sock.c-250-{\nnet/psp/psp_sock.c:251:\tstruct psp_assoc *pas, *next;\nnet/psp/psp_sock.c-252-\n--\nnet/psp/psp_sock.c=266=void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk)\nnet/psp/psp_sock.c-267-{\nnet/psp/psp_sock.c:268:\tstruct psp_assoc *pas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-269-\n--\nnet/psp/psp_sock.c-271-\t\trefcount_inc(\u0026pas-\u003erefcnt);\nnet/psp/psp_sock.c:272:\trcu_assign_pointer(tw-\u003epsp_assoc, pas);\nnet/psp/psp_sock.c-273-\ttw-\u003etw_validate_xmit_skb = psp_validate_xmit;\n--\nnet/psp/psp_sock.c=276=void psp_twsk_assoc_free(struct inet_timewait_sock *tw)\nnet/psp/psp_sock.c-277-{\nnet/psp/psp_sock.c:278:\tstruct psp_assoc *pas = rcu_dereference_protected(tw-\u003epsp_assoc, 1);\nnet/psp/psp_sock.c-279-\nnet/psp/psp_sock.c:280:\trcu_assign_pointer(tw-\u003epsp_assoc, NULL);\nnet/psp/psp_sock.c:281:\tpsp_assoc_put(pas);\nnet/psp/psp_sock.c-282-}\n--\nnet/psp/psp_sock.c=284=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb)\nnet/psp/psp_sock.c-285-{\nnet/psp/psp_sock.c:286:\tstruct psp_assoc *pas;\nnet/psp/psp_sock.c-287-\n--\ntools/testing/selftests/drivers/net/psp.py=606=def _check_assoc_list(cfg, psp_dev_id, ifindex, nsid=None):\n--\ntools/testing/selftests/drivers/net/psp.py-623-\ntools/testing/selftests/drivers/net/psp.py:624:def _data_basic_send_netkit_psp_assoc(cfg, version, ipver):\ntools/testing/selftests/drivers/net/psp.py-625-    \"\"\"\n--\ntools/testing/selftests/drivers/net/psp.py=659=def _get_psp_ver_ip6_variants():\n--\ntools/testing/selftests/drivers/net/psp.py-664-@ksft_variants(_get_psp_ver_ip6_variants())\ntools/testing/selftests/drivers/net/psp.py:665:def data_basic_send_netkit_psp_assoc(cfg, version, ipver):\ntools/testing/selftests/drivers/net/psp.py-666-    \"\"\"Test PSP data send via netkit with dev-assoc.\"\"\"\ntools/testing/selftests/drivers/net/psp.py-667-    cfg.require_ipver(ipver)\ntools/testing/selftests/drivers/net/psp.py:668:    _data_basic_send_netkit_psp_assoc(cfg, version, ipver)\ntools/testing/selftests/drivers/net/psp.py-669-\n--\ntools/testing/selftests/drivers/net/psp.py=698=def _dev_change_notify_multi_ns_netkit(cfg):\n--\ntools/testing/selftests/drivers/net/psp.py-725-\ntools/testing/selftests/drivers/net/psp.py:726:def _psp_dev_get_check_netkit_psp_assoc(cfg):\ntools/testing/selftests/drivers/net/psp.py-727-    \"\"\" Check psp dev-get output with netkit interface associated with PSP dev \"\"\"\n--\ntools/testing/selftests/drivers/net/psp.py=941=def main() -\u003e None:\n--\ntools/testing/selftests/drivers/net/psp.py-980-                        _assoc_check_list,\ntools/testing/selftests/drivers/net/psp.py:981:                        data_basic_send_netkit_psp_assoc,\ntools/testing/selftests/drivers/net/psp.py-982-                        _key_rotation_notify_multi_ns_netkit,\ntools/testing/selftests/drivers/net/psp.py-983-                        _dev_change_notify_multi_ns_netkit,\ntools/testing/selftests/drivers/net/psp.py:984:                        _psp_dev_get_check_netkit_psp_assoc,\ntools/testing/selftests/drivers/net/psp.py-985-                        _dev_assoc_no_nsid,\n"
}

gemini-3.7-flash

null

null

							input: 11671
							output: 36
							thoughts: 37
						

Here's my summary, as if I were thinking it:

**Digging into `sk_clone_lock` in `net/core/sock.c`**

Alright, I need to get a better handle on how `sk_clone_lock` operates. The best place to start is likely within `net/core/sock.c`, specifically around lines 2490 to 2520. That's usually where the core socket cloning functionality resides. I should really understand the locking strategy here, the contention points, and any potential race conditions that are addressed or introduced by this implementation. Knowing this is critical to understanding how network sockets are duplicated and how concurrent access is managed. I'm especially interested in the implications of this lock on overall system performance and the potential bottlenecks that might arise in high-load scenarios. I bet the comments around that section are very enlightening, let's see what the source code has to offer!

{
  "File": "net/core/sock.c",
  "FirstLine": 2460,
  "LineCount": 60
}

{
  "Contents": "2460:\t\tif (sk-\u003esk_kern_sock)\n2461:\t\t\tlockdep_set_class_and_name(\u0026sk-\u003esk_callback_lock,\n2462:\t\t\t\taf_kern_callback_keys + sk-\u003esk_family,\n2463:\t\t\t\taf_family_kern_clock_key_strings[sk-\u003esk_family]);\n2464:\t\telse\n2465:\t\t\tlockdep_set_class_and_name(\u0026sk-\u003esk_callback_lock,\n2466:\t\t\t\taf_callback_keys + sk-\u003esk_family,\n2467:\t\t\t\taf_family_clock_key_strings[sk-\u003esk_family]);\n2468:\t}\n2469:\t\n2470:\t/**\n2471:\t * sk_clone - clone a socket\n2472:\t * @sk: the socket to clone\n2473:\t * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)\n2474:\t * @lock: if true, lock the cloned sk\n2475:\t *\n2476:\t * If @lock is true, the clone is locked by bh_lock_sock(), and\n2477:\t * caller must unlock socket even in error path by bh_unlock_sock().\n2478:\t */\n2479:\tstruct sock *sk_clone(const struct sock *sk, const gfp_t priority,\n2480:\t\t\t      bool lock)\n2481:\t{\n2482:\t\tstruct proto *prot = READ_ONCE(sk-\u003esk_prot);\n2483:\t\tstruct sk_filter *filter;\n2484:\t\tbool is_charged = true;\n2485:\t\tstruct sock *newsk;\n2486:\t\n2487:\t\tnewsk = sk_prot_alloc(prot, priority, sk-\u003esk_family);\n2488:\t\tif (!newsk)\n2489:\t\t\tgoto out;\n2490:\t\n2491:\t\tsock_copy(newsk, sk);\n2492:\t\n2493:\t\tnewsk-\u003esk_prot_creator = prot;\n2494:\t#ifdef CONFIG_BPF_SYSCALL\n2495:\t\tRCU_INIT_POINTER(newsk-\u003esk_bpf_storage, NULL);\n2496:\t#endif\n2497:\t#if IS_ENABLED(CONFIG_INET_PSP)\n2498:\t\tRCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL);\n2499:\t#endif\n2500:\t\n2501:\t\t/* SANITY */\n2502:\t\tif (likely(newsk-\u003esk_net_refcnt)) {\n2503:\t\t\tget_net_track(sock_net(newsk), \u0026newsk-\u003ens_tracker, priority);\n2504:\t\t\tsock_inuse_add(sock_net(newsk), 1);\n2505:\t\t} else {\n2506:\t\t\t/* Kernel sockets are not elevating the struct net refcount.\n2507:\t\t\t * Instead, use a tracker to more easily detect if a layer\n2508:\t\t\t * is not properly dismantling its kernel sockets at netns\n2509:\t\t\t * destroy time.\n2510:\t\t\t */\n2511:\t\t\tnet_passive_inc(sock_net(newsk));\n2512:\t\t\t__netns_tracker_alloc(sock_net(newsk), \u0026newsk-\u003ens_tracker,\n2513:\t\t\t\t\t      false, priority);\n2514:\t\t}\n2515:\t\n2516:\t\tsk_node_init(\u0026newsk-\u003esk_node);\n2517:\t\tsock_lock_init(newsk);\n2518:\t\n2519:\t\tif (lock)\n"
}

gemini-3.7-flash

null

null

							input: 12911
							output: 19
							thoughts: 445
						

**Analyzing the `sk_clone` Function**

Okay, let's break down this `sk_clone` function. The core of the issue seems to stem from how socket structures are copied during cloning. Specifically, `sock_copy(newsk, sk)` is just a `memcpy`. This means when we clone a socket, `newsk->psp_assoc` simply gets a direct copy of `sk->psp_assoc`, without any proper reference counting. This is a red flag. Think about it: when cloning a listening socket to a child socket, `newsk->psp_assoc` is pointing to the same memory as the parent's! This shared ownership, without proper tracking, is screaming potential for chaos.

The problem? Either socket, the parent or the child, could free the `psp_assoc` or destroy it. If either one does a `psp_sk_assoc_free(sk)` or dereferences it, it could lead to a classic use-after-free, a double-free, or even an underflow of the reference count. Nightmare scenario!

The fix, however, makes perfect sense. Setting `RCU_INIT_POINTER(newsk->psp_assoc, NULL);` explicitly clears the pointer in `newsk`. This is the vital step: it breaks the link, ensuring the child socket doesn't inherit the parent's `psp_assoc` without the reference counting or any shared memory. Now, that is a clean separation.

Now, let's pivot to memory safety: I need to rule out uninitialized memory concerns or information leaks.

In `sk_clone` we have `sock_copy(newsk, sk)` followed by `RCU_INIT_POINTER(newsk->psp_assoc, NULL)`. I don't see any uninitialized memory issues. Initially, `newsk->psp_assoc` is copied from the source, which should be initialized. Then, we explicitly set it to `NULL`. This is a safe sequence. The root cause is definitely the use-after-free/double-free bug, where the socket cloning copied a pointer without incrementing the refcount or clearing it. This is why KASAN catches these use-after-free and double-free bugs.

But, I am not ready to be completely satisfied. I need to make sure there are no other subtle leaks. Are there any uninitialized memory reads, info leaks to userspace, or uninitialized padding involved? Let's give `psp_assoc` a thorough inspection with a KMSAN-like approach. I'll need to trace its usage throughout the codebase to be sure. This is where the real work begins.

{
  "Expression": "psp_sk_assoc"
}

{
  "Output": "include/net/psp/functions.h=33=unsigned int psp_key_size(u32 version);\ninclude/net/psp/functions.h:34:void psp_sk_assoc_free(struct sock *sk);\ninclude/net/psp/functions.h-35-void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk);\n--\ninclude/net/psp/functions.h=37=void psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb);\ninclude/net/psp/functions.h-38-\ninclude/net/psp/functions.h:39:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-40-{\n--\ninclude/net/psp/functions.h=45=psp_enqueue_set_decrypted(struct sock *sk, struct sk_buff *skb)\n--\ninclude/net/psp/functions.h-48-\ninclude/net/psp/functions.h:49:\tpas = psp_sk_assoc(sk);\ninclude/net/psp/functions.h-50-\tif (pas \u0026\u0026 pas-\u003etx.spi)\n--\ninclude/net/psp/functions.h=116=psp_sk_rx_policy_check(struct sock *sk, struct sk_buff *skb)\ninclude/net/psp/functions.h-117-{\ninclude/net/psp/functions.h:118:\treturn __psp_sk_rx_policy_check(skb, psp_sk_assoc(sk));\ninclude/net/psp/functions.h-119-}\n--\ninclude/net/psp/functions.h=150=static inline unsigned int psp_sk_overhead(const struct sock *sk)\n--\ninclude/net/psp/functions.h-157-#else\ninclude/net/psp/functions.h:158:static inline void psp_sk_assoc_free(struct sock *sk) { }\ninclude/net/psp/functions.h-159-static inline void\n--\ninclude/net/psp/functions.h=163=psp_reply_set_decrypted(const struct sock *sk, struct sk_buff *skb) { }\ninclude/net/psp/functions.h-164-\ninclude/net/psp/functions.h:165:static inline struct psp_assoc *psp_sk_assoc(const struct sock *sk)\ninclude/net/psp/functions.h-166-{\n--\nnet/ipv4/af_inet.c=140=void inet_sock_destruct(struct sock *sk)\n--\nnet/ipv4/af_inet.c-166-\tdst_release(rcu_dereference_protected(sk-\u003esk_rx_dst, 1));\nnet/ipv4/af_inet.c:167:\tpsp_sk_assoc_free(sk);\nnet/ipv4/af_inet.c-168-}\n--\nnet/psp/psp_sock.c=118=void psp_assoc_put(struct psp_assoc *pas)\n--\nnet/psp/psp_sock.c-123-\nnet/psp/psp_sock.c:124:void psp_sk_assoc_free(struct sock *sk)\nnet/psp/psp_sock.c-125-{\n--\nnet/psp/psp_sock.c=132=int psp_sock_assoc_set_rx(struct sock *sk, struct psp_assoc *pas,\n--\nnet/psp/psp_sock.c-141-\nnet/psp/psp_sock.c:142:\tif (psp_sk_assoc(sk)) {\nnet/psp/psp_sock.c-143-\t\tNL_SET_ERR_MSG(extack, \"Socket already has PSP state\");\n--\nnet/psp/psp_sock.c=177=int psp_sock_assoc_set_tx(struct sock *sk, struct psp_dev *psd,\n--\nnet/psp/psp_sock.c-186-\nnet/psp/psp_sock.c:187:\tpas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-188-\tif (!pas) {\n--\nnet/psp/psp_sock.c=266=void psp_twsk_init(struct inet_timewait_sock *tw, const struct sock *sk)\nnet/psp/psp_sock.c-267-{\nnet/psp/psp_sock.c:268:\tstruct psp_assoc *pas = psp_sk_assoc(sk);\nnet/psp/psp_sock.c-269-\n"
}

gemini-3.7-flash

null

null

							input: 15121
							output: 237
							thoughts: 739
						

**Analyzing a Socket Cloning Bug and KMSAN Applicability**

Okay, here's what I've got. I'm looking at a patch that addresses a memory safety issue specifically within the socket cloning mechanism. The core of the problem lies in how `psp_assoc` (a security association related structure) is handled when a socket (`sk`) is cloned to create a new socket (`newsk`).

Essentially, `sock_copy` was copying the `sk->psp_assoc` pointer to `newsk->psp_assoc` without correctly managing the reference count of the underlying `psp_assoc` structure. This meant both `sk` and `newsk` were pointing to the same `psp_assoc` without properly indicating shared ownership through incrementing the reference counter. Later, when either the original or the cloned socket was destroyed via `inet_sock_destruct` and `psp_sk_assoc_free`, the associated `psp_assoc` struct would have `psp_assoc_put` called, which decremented the reference count. This could lead to a double-free or use-after-free scenario if both sockets were eventually destroyed, leading to potentially corrupted state.

The patch fixes this by initializing `newsk->psp_assoc` to `NULL` using `RCU_INIT_POINTER` *during* the clone operation. This prevents `newsk` from inheriting the parent's association at all.

Now, let's consider whether this change, and the bug it fixes, warrants a `NeedsKMSAN = true` flag. I have to analyze if this introduces or eliminates uninitialized memory reads, writes or memory-related flaws.

I've carefully reviewed the code and I can definitively say that this issue is *not* about uninitialized memory being exposed. It's strictly about object lifetime and reference count management, specifically the improper aliasing and potential double-free/use-after-free conditions. I've gone through the standard KMSAN checks:

1.  Is there kernel data sent to userspace with uninitialized fields? No.
2.  Is there conditional logic relying on uninitialized variables? No.
3.  Are complex data structures allocated with potentially uninitialized fields that are then read later? No.
4.  Is the use of bounds checks, lengths, etc., allowing access to uninitialized bytes? No.

This bug falls squarely into the domain of reference counting and pointer management. KASAN is already the perfect tool for tracking these sorts of memory safety issues (dangling pointers, use-after-free, double-free) by ensuring memory is valid.

Therefore, KMSAN is not required here, and I'll confidently set `NeedsKMSAN = false`. It's a clear case of KASAN's strengths, not KMSAN's. Time to call the `set-results` tool and move on.

{
  "KMSANReasoning": "The patch modifies `sk_clone()` in `net/core/sock.c` to explicitly initialize `newsk-\u003epsp_assoc` to `NULL` via `RCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL)`. \n\nWhen a socket is cloned, `sock_copy()` performs a shallow copy of the socket structure from parent to child. Without clearing `newsk-\u003epsp_assoc`, the cloned socket inherited the parent's pointer to `struct psp_assoc` without taking an additional reference count. Upon destruction of the cloned socket (`psp_sk_assoc_free`), `psp_assoc_put()` would be called, leading to reference underflow, use-after-free, or double-free errors.\n\nThis change is purely addressing object lifecycle, pointer aliasing, and reference counting issues (which are detected by KASAN). No uninitialized memory is allocated, read, or leaked to userspace. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch modifies `sk_clone()` in `net/core/sock.c` to explicitly initialize `newsk-\u003epsp_assoc` to `NULL` via `RCU_INIT_POINTER(newsk-\u003epsp_assoc, NULL)`. \n\nWhen a socket is cloned, `sock_copy()` performs a shallow copy of the socket structure from parent to child. Without clearing `newsk-\u003epsp_assoc`, the cloned socket inherited the parent's pointer to `struct psp_assoc` without taking an additional reference count. Upon destruction of the cloned socket (`psp_sk_assoc_free`), `psp_assoc_put()` would be called, leading to reference underflow, use-after-free, or double-free errors.\n\nThis change is purely addressing object lifecycle, pointer aliasing, and reference counting issues (which are detected by KASAN). No uninitialized memory is allocated, read, or leaked to userspace. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}